CAUTION: Before you begin any of the procedures in this section, follow the steps in "Safety Instructions."
CAUTION: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your computer's electronic components. You can do so by touching an unpainted metal surface on the computer chassis.
A coin-cell battery maintains computer configuration, date, and time information. The battery can last several years.
The battery may need replacing if an incorrect time or date is displayed during the boot routine along with a message such as:
Time-of-day not set - please run SETUP program
or
Invalid configuration information -
please run SETUP program
or
Strike the F1 key to continue,
F2 to run the setup utility
To determine whether you need to replace the battery, reenter the time and date in system setup and exit the program to save the information. Turn off your computer and disconnect it from the electrical outlet for a few hours; then reconnect the computer, turn it on, and enter system setup. If the date and time are not correct in system setup, replace the battery.
You can operate your computer without a battery; however, without a battery, the configuration information is erased if the computer is turned off or unplugged from the electrical outlet. In this case, you must enter system setup and reset the configuration options.
CAUTION: A new battery can explode 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 replace the battery:
If you have not already done so, make a copy of your configuration information, found
in system setup.
Shut down the computer through the Start menu.
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 electrical outlets, and then
press the power button to ground the system board.
Remove the computer stand, if it is attached.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
Open the computer 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.
Locate the battery socket (see illustration).
NOTICE: If you pry the battery out of its socket with a blunt object, be careful not to touch the
system board with the object. Ensure that the object is inserted between the battery and the
socket before you attempt to pry out the battery. Otherwise, you may damage the system board
by prying off the socket or by breaking circuit traces on the system board.
Remove the battery by carefully prying it out of its socket with your fingers or with a
blunt, nonconducting object such as a plastic screwdriver.
Insert the new battery into the socket with the side labeled "+" facing up, and snap the
battery into place.
Close the computer cover.
Attach the computer stand, if it is used.
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then
plug it into the computer.
Connect your computer and devices to electrical outlets, and turn them on.
After you open and close the cover, the chassis intrusion detector, if enabled, causes the following message to appear on the screen at the next computer start-up:
NOTE: If a setup password has been assigned by someone else, contact your network
administrator for information on resetting the chassis intrusion detector.
Enter system setup and restore the settings you recorded in step 1.
