Dell OptiPlex Gn Reference and Installation Guide (.pdf) - Page 77
See Using the System Setup Program, Diagnostics and Trouble, shooting Guide
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7. Replace the computer cover, and then reconnect your computer and peripherals to their power sources and turn them on. 8. Enter the System Setup program, and confirm that the battery is operating properly. See Chapter 2, "Using the System Setup Program," for information on running the System Setup program. 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. 9. Turn off your computer, and unplug it for at least 10 minutes. 10. 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. Installing System Board Options 6-11