Dell OptiPlex GX280 - Manual (Page 127)

Mini-Tower Computer
Jumper Setting Description
PSWD
(default)
Password features are enabled.
Password features are disabled.
RTCRST Real-time clock reset.
jumpered unjumpered
Replacing the System Board
Removing the System Board: Small Form-Factor, Small Desktop, Small
Mini-Tower Computers
1. Shut down the computer through the Start menu.
2. 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.
3. Disconnect any telephone or telecommunication lines from the computer.