Dell OptiPlex GX240 - Manual (Page 66)

68 Installing Upgrades
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NOTICE: Before disconnecting a device from the computer, wait 10 to 20
seconds after disconnecting the computer from its electrical outlet. Before
removing a component from the system board, verify that the standby power
light on the system board has turned off. To locate this light, see “
System
Board Components .”
1 If you are replacing an expansion card, remove the current driver for
the expansion card from the operating system.
2 Turn off the computer and devices, disconnect them from their
electrical outlets, wait 10 to 20 seconds.
3 Open the computer cover .
4 If you have a small desktop computer, remove the expansion-card cage .