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Precautionary Measures

Internal Views

Computer Cover

To remove the computer cover in the small form-factor chassis, perform the following steps:

Figure 4. Computer Cover Replacement

To replace the small form-factor chassis computer cover, perform the following steps:

1. Face the front of the computer and hold the cover at a slight angle (see Figure 4).
   
   
2. Align the bottom of the cover with the bottom of the chassis and insert the hooks on the cover into the recessed slots on the computer chassis so that the tabs catch the hooks inside the slots.
   
   
3. Pivot the cover down toward the back of the chassis and into position.
   
   Make sure that the securing buttons click into place.
   
   
4. If you wish to install a padlock, slide the padlock ring out of the cover.

NOTE: After you remove and replace the cover, the chassis intrusion detector will cause the following message to be displayed at the next system start-up: ALERT! Cover was previously removed.

For instructions on resetting the chassis intrusion detector, see "Checking System Functions."

Figure 5. Eject and Power Button Removal

1 Diskette eject button 2 Power button

To remove the eject and power buttons in the small form-factor chassis, perform the following steps:

1. Lay the computer cover on a flat work surface, with the inside of the top cover facing up.
   
   
2. To remove the 3.5-inch diskette-drive eject button, pull gently on the plastic part of the button until it comes free.
   
   
3. To remove the power button, use a small screwdriver and push in the two plastic clips that hold the button to the bezel. When these clips are released, the button and the spring come free from the bezel.

Figure 6. Control Panel Removal

1 Screw 2 Control panel

To remove the control panel in the small form-factor chassis, perform the following steps:

1. Remove the drive shelf.
   
   
2. Remove the power supply.
   
   
3. Disconnect the control panel cable from the control panel connector on the system board (see "System Board Labels" for the location of the PANEL connector).
   
   Note the routing of the control panel cable as you remove it from the chassis.
   
   
4. From inside the chassis, remove the mounting screw that secures the control panel to the chassis.
   
   
5. Disconnect the chassis intrusion switch cable connector from the control panel.
   
   
6. Remove the control panel from the chassis.
   
   Note the routing of the control panel cable as you remove it from the chassis.

When you install the replacement control panel, be sure to put the right side of the control panel behind the mounting tab.

Figure 7. Chassis Intrusion Switch Removal

1 Control panel 2 Chassis intrusion switch

To remove the chassis intrusion switch in the small form-factor chassis, perform the following steps:

1. Remove the drive shelf.
   
   
2. Remove the power supply.
   
   
3. Remove the control panel.
   
   
4. Disconnect the chassis intrusion switch cable connector from the control panel on the front of the chassis.
   
   Note the routing of the chassis intrusion cable as you remove it from the chassis. Chassis hooks may hold the cable in place inside the chassis.
   
   
5. Slide the chassis intrusion switch out of its slot and remove the switch and its attached cable from the chassis (see Figure 7).
   
   
6. Install the replacement chassis intrusion switch and cable.
   
   
7. To reset the chassis intrusion detector, enter System Setup during the system's POST. In the Chassis Intrusion option, press the left- or right-arrow key to select Reset, and then choose Enabled, Enabled-Silent, or Disabled.

NOTE: In all of the following procedures, left and right refer to your left and right as you face the front of the computer.

  Figure 8. Drive Locations

1 Chassis intrusion switch 2 CD-ROM drive 3 3.5-inch diskette drive 4 Hard-disk drive

You must remove the drive shelf before removing the 3.5-inch diskette drive, the CD-ROM drive, the hard-disk drive, the control panel, the chassis intrusion switch, or the power supply.

Figure 9. Drive Shelf Removal

1 Drive shelf 2 Release tabs (2)

To remove the drive shelf from the small form-factor chassis, perform the following steps:

1. Disconnect the power and interface cables from the diskette drive and CD-ROM drive.
   
   
2. Press inward on the two drive shelf release tabs, and pull the shelf forward and out of the chassis (see Figure 9).

Figure 10. Hard-Disk Drive/Bracket Removal

1 Drive bracket 2 Release tabs (2)

CAUTION: To avoid the possibility of electric shock, turn off the computer and any peripherals, disconnect them from electrical outlets, and then wait at least 15 seconds before you remove the computer cover. Also, before you remove a drive, see the other precautions in "Precautionary Measures."

To remove the hard-disk drive/bracket assembly in the small form-factor chassis, perform the following steps:

1. If you are replacing a hard-disk drive that contains data you want to keep, make a backup copy of your files before you continue this procedure.
   
   
2. Remove the computer cover if not already removed.
   
   
3. Remove the drive shelf.
   
   
4. Squeeze the tabs on each side of the hard-disk drive/bracket, and pull the hard-disk drive/bracket forward about one inch (see Figure 10).
   
   
5. Disconnect the power and interface cables from the drive.
   
   
6. Lift the hard-disk drive/bracket upward and out of the chassis.
   
   
7. To remove the hard-disk drive from the bracket, place the drive/bracket on a flat surface with the bracket facing up.
   
   
8. Remove the four screws securing the hard-disk drive to the bottom of the bracket (see Figure 11).
   

Figure 11. Drive Bracket Removal

1 Drive 2 Drive bracket 3 Screws (4)

Figure 12. Hard-Disk Drive/Bracket Replacement

1 Tabs on bottom of the drive bracket 2 Hooks on chassis floor 3 Drive bracket 4 Release tabs (2)

To install a replacement hard-disk drive in the small form-factor chassis, perform the following steps.

CAUTION: To avoid the possibility of electric shock, turn off the computer and any peripherals, disconnect them from electrical outlets, and then wait at least 15 seconds before you remove the computer cover. Also, before you install a drive, see the other precautions in "Precautionary Measures."

NOTICE: To avoid possibly damaging the drive by ESD, ground yourself by touching an unpainted metal surface on the back of the computer.

NOTICE: When you unpack the drive, do not set it on a hard surface, which may damage the drive. Instead, set the drive on a surface, such as a foam pad, that will sufficiently cushion it.

Figure 13. Hard-Disk Drive Cable Attachment

1 IDE1 connector 2 EIDE cable 3 Power cable

NOTICE: You must connect the blue connector on the EIDE interface cable to the IDE1 connector on the system board to avoid possible damage to your system.

NOTICE: You must match the red-colored stripe on the EIDE cable with pin 1 on the drive's interface connector to avoid possible damage to your system.

NOTICE: You must match the red-colored stripe on the EIDE interface cable with pin 1 on the IDE1 connector to avoid possible damage to your system.

12. If it is not already connected, connect the blue connector on the EIDE interface cable to the IDE1 connector on the system board.
    
    To locate the IDE1 connector on the system board, see "System Board Components."
    
    
13. Replace the drive shelf and connect the diskette and CD-ROM drive power and interface cables.
    
    
14. Replace the computer cover. Then reconnect your computer and peripherals to their electrical outlets, and turn on the peripherals.
    
    
15. If the drive you just installed is the primary drive, insert a bootable system diskette into drive A.
    
    
16. Turn on the computer system.
    
    
17. Enter System Setup and update Primary Drive 0 (see the online System User's Guide for complete information on System Setup).
    
    
18. After you update the System Setup settings, reboot the system.
    
    
19. Partition and logically format your computer's hard-disk drive before proceeding to the next step.

See the documentation for your operating system for instructions.

NOTE: On systems with hard-disk drives larger than 2 GB, create a primary partition of 2 GB and divide the remaining capacity into partitions of 2 GB or less. For example, a system with a 2.5-GB hard-disk drive would have a primary partition of 2 GB (drive C) and a second partition of 500 MB (drive D). Hard-disk drives must be partitioned this way because MS-DOS�—based operating systems (including Microsoft� Windows NT�, when using a FAT16 file system) do not support drive partitions larger than 2 GB.

20. Test the hard-disk drive by running the Dell Diagnostics (see the online System User's Guide for complete information).
    
    
21. If the drive you just installed is the primary drive, install your operating system on the hard-disk drive.
    
    For instructions, refer to the documentation that came with your operating system.

To remove the 3.5-inch diskette drive from the drive shelf, perform the following steps.

NOTE: This procedure assumes that you have removed the drive shelf from the chassis.

1. Press down on the release latch on the top left side of the 3.5-inch diskette drive.
   
   The 3.5-inch diskette drive will pop up slightly when the latch disengages.
   
   
2. Pivot the 3.5-inch diskette drive up and out of the drive shelf.
   

To replace the 3.5-inch diskette drive, perform the following steps:

1. Rotate the replacement drive into position under the right diskette drive bracket on the drive shelf.
   
   
2. Lower the left side of the diskette drive while gently pressing downward, so that the slots on the bottom of the 3.5-inch diskette drive engage in hooks on the drive shelf.
   
   
3. Ensure that the latch on the left side of the 3.5-inch diskette drive engages the top of the diskette drive.
   
   If necessary, press on the latch from the bottom of the drive shelf.
   
   
4. Replace the drive shelf and connect the interface and power cable connectors.

Figure 14. CD-ROM Drive Removal

1 Drive release tab

To remove a CD-ROM drive in the small form-factor chassis, perform the following steps.

NOTE: This procedure assumes that you have removed the drive shelf from the chassis.

1. Push down on the drive release tab on the right side of the drive (see Figure 14).
   
   
2. Slide the CD-ROM drive assembly forward and up and out of the chassis.

To replace a CD-ROM drive, perform the following steps:

1. Align the tabs on the bottom of the CD-ROM drive with the notches on the drive shelf, and slide the drive toward the back of the shelf until it snaps into place (see Figure 15).

Figure 15. CD-ROM Drive Replacement

1 Tabs (2) 2 Notches (2)

2. Connect a power cable and an interface cable to the appropriate connectors on the back of the drive (see Figure 16).

Figure 16. CD-ROM Drive Cable Attachment

1 Interface cable 2 Power cable 3 Power input connector 4 Interface connector

Check all cable connections. Fold cables out of the way to provide airflow for the fan and cooling vents.

3. Replace the computer cover; reconnect your computer and peripherals to their electrical outlets, and turn them on.
   
   
4. Update your system configuration information.

Set the Drive 1 option under Drives: Primary to Auto. See the online System User's Guide for more information.

5. Verify that your system works correctly by running the Dell Diagnostics (see the online System User's Guide for complete information).

Figure 17. Power Supply Removal

1 Securing screw hole 2 AC power receptacle 3 Power supply 4 System board DC power connectors (2) 5 Drive DC power connectors (3)

To remove the system power supply in the small form-factor chassis, perform the following steps:

1. Disconnect the AC power cable from the back of the power supply.
   
   
2. Disconnect the DC power cables from the system board and the drives. 
   
   Note the routing of the DC power cables underneath the tabs in the chassis as you remove them from the system board and drives. It is important to route these cables properly when you replace them to prevent them from being pinched or crimped.
   
   
3. Remove the screw on the side of the chassis that secures the power supply.
   
   
4. Remove the screw below the AC power receptacle at the back of the chassis.
   
   
5. Slide the power supply toward the center of the computer approximately 1 inch.
   
   
6. Lift the power supply up and out the computer chassis.

Figure 18. Expansion-Card Cage Removal

1 Securing lever 2 Expansion-card cage 3 Tabs (2) 4 Hooks (2)

To remove the expansion-card cage from the small form-factor chassis, perform the following steps:

1. Remove the computer cover.

CAUTION: Use a wrist grounding strap as explained in "Precautionary Measures."

2. Examine any cables connected to expansion cards through the back-panel openings and disconnect any cables that will not extend to where the cage must be placed when it is removed from the chassis.
   
   
3. Locate the securing lever (see Figure 18) and rotate the lever upward until it stops in an upright position.
   
   
4. Lift the expansion-card cage up and out of the chassis.

To replace the expansion-card cage in the small form-factor chassis, perform the following steps:

1. With the securing lever in the upright position, align the tabs in the side of the expansion-card cage with the mating hooks on the left side of the chassis wall (see Figure 18). Slide the expansion-card cage into place.
   
   
2. Rotate the securing lever downward until it is flush with the top side of the chassis. Make sure that the riser board is fully seated in the RISER connector on the system board.
   
   
3. Reconnect any cables you removed in step 2 of the previous procedure.

The small form-factor chassis has a PCI riser board that has two PCI expansion-card connectors (see Figure 19).

Figure 19. PCI Riser Board

1 Auxiliary power LED (AUX_LED) 2 Remote Wakeup header (WOL) 3 PCI expansion-card connector 1 (PCI1) 4 PCI expansion-card connector 2 (PCI2)

To remove the PCI riser board in the small form-factor chassis, perform the following steps.

CAUTION: Ground yourself by touching an unpainted metal surface on the back of the computer.

CAUTION: Use a wrist grounding strap as explained in "Precautionary Measures."

1. Remove the expansion-card cage.
   
   
2. Remove the expansion cards installed from the slots.
   
   
3. Remove the screws securing the riser board to the expansion-card cage.
   
   
4. Lift the riser board off the expansion-card cage.

The subsections that follow contain procedures for removing system board components, which are shown in Figure 20.

Figure 20. System Board Components

1 Optional audio connectors 2 NIC connector 3 Standby power LED (AUX_PWR) 4 Video connector 5 CD-ROM drive  audio cable connector (optional) 6 Fan power connector 7 Telephony connector (optional) 8 Serial port 2 connector 9 USB connectors (2) 10 Mouse (upper) and keyboard (lower) connectors 11 Parallel port (upper) and serial port 1 (lower) connectors 12 Riser board connector 13 System board jumpers 14 IDE1 connector 15 IDE2 connector 16 Diskette/tape-drive connector 17 PC speaker connector 18 Battery 19 DIMM sockets (2) 20 Microprocessor package 21 3.3-V power connector 22 Control panel connector 23 DC power connector

System Board Jumper

Figure 21 shows the location of the PSWD jumper on the system board.

Figure 21. System Board Jumper

Table 1 lists the labels for connectors and sockets on the system board, and it gives a brief description of their functions.

Table 1. System Board Connectors and Sockets

The small form-factor GX110 chassis can accommodate up to two half-length 32-bit PCI expansion cards.  Figure 22 shows an example of a 32-bit PCI expansion card.

Figure 22. 32-Bit PCI Expansion Card

CAUTION: Use a wrist grounding strap as explained in "Precautionary Measures."

To remove an expansion card from the expansion-card cage, perform the following steps:

1. Remove the computer cover.
   
   
2. If necessary, disconnect any cables connected to the card.
   
   
3. Remove the expansion-card cage.
   
   
4. Remove the screw on the mounting bracket of the card you want to remove.
   
   
5. Grasp the card by its outside corners, and ease it out of its connector.
   
   
6. If you are removing the expansion card permanently, install a metal filler bracket over the empty opening.
   

NOTE: Installing filler brackets over empty expansion-card openings is necessary to maintain FCC certification of the system. The brackets also keep dust and dirt out of your computer.

7. Replace the computer cover, and reconnect your computer and peripherals to their power sources and turn them on.

NOTE: After you remove and replace the cover, the chassis intrusion detector will cause the following message to be displayed at the next system start-up: ALERT! Cover was previously removed.

8. To reset the chassis intrusion detector, enter System Setup during the system's POST. In the Chassis Intrusion option, press the left- or right-arrow key to select Reset, and then choose Enabled, Enabled-Silent, or Disabled.
   
   See the online System User's Guide for detailed information on the chassis intrusion detector.

NOTE: If a setup password has been assigned by someone else, contact the network administrator for information on resetting the chassis intrusion detector.

Figure 23. Expansion Card Replacement

1 Expansion card 2 Card-edge connector 3 Riser board 4 Expansion-card connector 5 Expansion-card cage

CAUTION: Use a wrist grounding strap as explained in "Precautionary Measures."

CAUTION: Some network cards automatically start up the system when they are connected. To guard against electrical shock, be sure to unplug your computer from its electrical outlet before installing any expansion cards.

To install an expansion card, perform the following steps:

1. Prepare the expansion card for installation, and remove the computer cover.
   
   See the documentation that came with the expansion card for information on configuring the card, making internal connections, or otherwise customizing it for your system.
   
   
2. Remove the screw and remove the metal filler bracket that covers the opening for the expansion card you intend to use (see Figure 24).
   
   Save the screw to use when installing the expansion card later in this procedure.

Figure 24. Filler Bracket Removal

1 Filler bracket

3. Insert the expansion card into the expansion-card connector.
   
   If the expansion card is full-length, insert the front end of the card into the corresponding card guide on the inside front of the chassis, as you carefully insert the card's edge connector firmly into the expansion-card connector.
   
   
4. When the card is firmly seated in the connector, secure the card's mounting bracket to the chassis with the screw you removed in step 2.
   
   
5. Connect any cables that should be attached to the card.
   
   See the documentation for the card for information about the card's cable connections.
   
   
6. Replace the computer cover, and reconnect your computer and peripherals to their power sources and turn them on.
   

NOTE: After you remove and replace the cover, the chassis intrusion detector will cause the following message to be displayed at the next system start-up: ALERT! Cover was previously removed.

7. To reset the chassis intrusion detector, enter System Setup during the system's POST. In the Chassis Intrusion option, press the left- or right-arrow key to select Reset, and then choose Enabled, Enabled-Silent, or Disabled.
   
   See the online System User's Guide for detailed information on the chassis intrusion detector.

NOTE: If a setup password has been assigned by someone else, contact the network administrator for information on resetting the chassis intrusion detector.

Figure 25. DIMM Removal

1 Ejectors (2)

CAUTION: Use a wrist grounding strap as explained in "Precautionary Measures."

To remove a DIMM, perform the following steps:

1. Push outward on the two DIMM socket ejectors simultaneously until the DIMM is released from its socket.
   
   
2. Lift the DIMM away from the socket.

To install a DIMM, press the DIMM fully into the socket while closing the ejectors to lock the DIMM into the socket (see Figure 26).

Figure 26. DIMM Installation

1 Ejectors (2) 2 Notches (2)

To remove the cooling fan, heat sink assembly, and microprocessor package from the small form-factor chassis, perform the following steps.

CAUTION: Use a wrist grounding strap as explained in "Precautionary Measures."

1. Remove the computer cover, observing all safety precautions.
   
   
2. Disconnect the cooling fan power cable from the fan power connector on the system board.
   
   
3. Remove the two thumbscrews securing the cooling fan to the heat sink assembly.
   
   
4. Lift the cooling fan off the heat sink assembly (see Figure 27).

Figure 27. Cooling Fan Removal

1 Thumbscrews (2) 2 Cooling fan 3 Retaining clip 4 ZIF socket 5 Heat sink assembly

5. Remove the metal retaining clip that secures the heat sink assembly to the microprocessor package by gently pushing down on the folded part of the retaining clip with a small screwdriver.
   
   The retaining clip hooks over tabs on the sides of the ZIF socket (see Figure 28).

Figure 28. Retaining Clip and Heat Sink Assembly Removal

1 Retaining clip 2 Heat sink assembly 3 Microprocessor package 4 ZIF socket

CAUTION: The microprocessor package and heat sink assembly can get extremely hot. To avoid burns, be sure the package and assembly have had sufficient time to cool before you touch them.

6. Remove the heat sink assembly from the microprocessor package.

NOTICE: Be careful not to bend any of the pins when you remove the microprocessor package from the ZIF socket. Bending the package pins can permanently damage the microprocessor.

7. Detach and lift out the microprocessor package from the ZIF socket.
   
   The ZIF socket has a lever-type handle that secures and releases the microprocessor package (see Figure 29) from the ZIF socket.
   
   
   1. Pull the socket release lever straight out until the microprocessor package releases.
      
      
   2. Remove the microprocessor package from the socket.
      
      

Leave the release lever extended so that the socket is ready for the new microprocessor package.

Figure 29. Microprocessor Package Removal

1 Microprocessor package 2 Socket release lever 3 ZIF socket

To replace the microprocessor package, heat sink assembly, and cooling fan in the small form-factor chassis, perform the following steps.

CAUTION: Use a wrist grounding strap as explained in "Precautionary Measures."

1. Unpack the new microprocessor package.

NOTICE: You must position the microprocessor package correctly in the ZIF socket to avoid permanent damage to the microprocessor and the computer when you turn on the system.

2. Install the microprocessor package in the ZIF socket (see Figure 30).
   
   
   1. If the release lever on the ZIF socket is not all the way out, move it to that position now.
      
      
   2. Align pin-1 (the beveled corner) of the microprocessor package and pin-1 of the ZIF socket.
      
      
   3. Set the microprocessor package lightly in the socket, making sure that all the pins are headed into the correct holes.
      
      Because your system uses a ZIF socket, there is no need to use force (which could bend the pins if the microprocessor package is misaligned).
      
      
   4. When the microprocessor package is positioned correctly, press it with minimal pressure to fully seat it in the ZIF socket.
      
      
   5. When the microprocessor package is fully seated, pivot the release lever back toward the system board until it snaps into place, securing the microprocessor package.

Figure 30. Microprocessor Package Replacement

1 Microprocessor package 2 ZIF socket 3 Pin-1 (alignment corner)

3. Unpack the heat sink included in your upgrade kit.

NOTICE: Do not reuse the old heat sink when replacing the microprocessor package. Doing so can cause the microprocessor to overheat because of an inadequate amount of thermal compound between the heat sink assembly and the microprocessor package.

4. Replace the heat sink assembly.
   
   
   1. Peel the release liner from the adhesive tape that is attached to the bottom of the new heat sink assembly.
      
      
   2. Place the heat sink assembly on top of the microprocessor package.
      
      
   3. Orient the metal retaining clip as shown in Figure 31, and hook the unhinged end of the clip over the tab on the top edge of the ZIF socket.
      
      
   4. Press down on the hinged end of the clip to snap the clip over the tab on the bottom edge of the ZIF socket.

Figure 31. Heat Sink Assembly Replacement

1 Retaining clip 2 Heat sink assembly 3 Microprocessor package 4 ZIF socket

5. Replace the cooling fan on top of the heat sink assembly, and secure the fan with the two thumbscrews.
   
   
6. Reconnect the cooling fan power cable to its system board connector.

As the system boots, it detects the presence of the new microprocessor and automatically changes the system configuration information in System Setup.

NOTE: After you remove and replace the cover, the chassis intrusion detector will cause the following message to be displayed at the next system start-up: ALERT! Cover was previously removed.

1. Enter System Setup and confirm that the system data area correctly identifies the type of installed microprocessor.

NOTE: For instructions on using System Setup, see the online System User's Guide.

2. While in System Setup, reset the Chassis Intrusion option by pressing the left- or right-arrow key to select Reset and then choosing Enabled, Enabled-Silent, or Disabled.
   
   See the online System User's Guide for information on the chassis intrusion detector.

NOTE: If a setup password has been assigned by someone else, contact the network administrator for information on resetting the chassis intrusion detector.

3. Run the Dell Diagnostics to verify that the new processor is operating correctly.

Figure 32. System Battery Removal

1 Battery 2 Battery socket

CAUTION: There is a danger of the new battery exploding if it is incorrectly installed. Replace the battery only with the same or equivalent type recommended by the manufacturer. Discard used batteries according to the manufacturer's instructions.

To remove the system battery from the small form-factor chassis, perform the following steps:

1. If possible, enter System Setup and print the System Setup screens.
   
   
2. Remove the system battery by carefully prying it out of its socket with your fingers or with a blunt, nonconducting object such as a plastic screwdriver.

When you replace the system battery, orient the new battery with the "+" facing up. Insert the battery into its socket and snap it into place.

Figure 33. System Board Removal

To remove the system board in the small form-factor chassis, perform the following steps:

1. Disconnect all cables from their connectors at the back of the computer, observing all safety precautions in "Precautionary Measures."
   
   
2. Remove the computer cover.
   
   
3. Remove the drive shelf assembly.
   
   
4. Remove the expansion-card cage.
   
   
5. Remove the hard-disk drive/bracket assembly.
   
   
6. Disconnect all cables from the system board.
   
   
7. Remove the screw that secures the existing system board to the bottom of the chassis (see Figure 33).
   
   Before you remove the existing system board, visually compare the replacement system board to the existing system board to make sure that you have the correct part.
   
   
8. Slide the system board toward the front of the chassis until it stops.
   
   
9. Carefully lift the system board out of the chassis (lift evenly and do not twist the system board). Place the system board that you just removed next to the replacement system board.

To replace a system board in the small form-factor chassis, perform the following steps:

1. Transfer components from the existing system board to the replacement system board.
   
   
   1. Remove the DIMMs and install them on the replacement board.
      
      
   2. Remove the microprocessor package from the existing system board and transfer it to the replacement system board.
      
      
   3. Configure the settings of the replacement system board.
      
      Set the jumper on the replacement system board so it is identical to the one on the existing board.
      
      

NOTE: Some components and connectors on the replacement system board may be in different locations than the corresponding connectors on the existing system board.

2. Orient the replacement system board in the computer chassis. Push down near each slot to engage the grounding clip onto its corresponding chassis tab.
   
   
3. Push evenly on both sides of the system board as you slide and lock it into position (do not twist the system board).
   
   
4. Replace the screw that secures the system board to the chassis.
   
   
5. Replace any components and cables that you removed from the system board.
   
   
6. Replace the hard-disk drive/bracket assembly.
   
   
7. Replace the expansion-card cage.
   
   
8. Replace the drive shelf assembly.
   
   
9. Replace the computer cover.
   
   
10. Reconnect all cables from their connectors at the back of the computer.

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