Dell OptiPlex GX1p - Manual (Page 40)

6. Replace the expansion-card cage as described in " Replacing the Expansion-Card Cage ."
7. Replace the computer cover , and reconnect your computer and peripherals to their electrical outlets and turn them on.
8. Enter the System Setup program and confirm that the battery is operating properly.
9. Enter the correct time and date through the System Setup program's Time and Date categories. Also, use the copy you made in step 1 to
restore the correct settings for other system configuration information. Then exit the System Setup program.
10. Turn off your computer, and unplug it for at least 10 minutes.
11. After 10 minutes, plug in the computer, turn it on, and enter the System Setup program. If the time and date are still incorrect, see the chapter
titled "Getting Help" in your Diagnostics and Troubleshooting Guide for instructions on obtaining technical assistance.
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NOTE: If Enabled, the Chassis Intrusion option will cause the following message to be displayed at the next system start-up:
ALERT! Cover was previously removed.