Ensure that your computer and attached devices are turned off. If your computer and
attached devices did not automatically turn off when you shut down your computer,
turn them off now.
NOTICE: To disconnect a network cable, first unplug the cable from your computer and then
unplug it from the network wall jack.
Disconnect any telephone or telecommunication lines from the computer.
Disconnect your computer and all attached devices from their electrical outlets, and
then press the power button to ground the system board.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
NOTICE: Before touching anything inside your computer, ground yourself by touching an
unpainted metal surface, such as the metal at the back of the computer. While you work,
periodically touch an unpainted metal surface to dissipate any static electricity that could harm
internal components.
Remove the fan assembly.
Disconnect the AC power cable from the AC power connector on the back of the
power supply.
Unplug the DC power cables from the drives and system board.
Remove the four screws that secure the power supply to the back of the computer.
Remove the power supply from the computer.
Replacing the Power Supply
Slide the power supply into place.
Replace the four screws that secure the power supply to the back of the computer.
Reinstall the fan assembly.
Reconnect the DC power cables to the drives and system board.
