Dell Precision 340 - Manual (Page 30)

Mini-Tower Computer
Installing an Expansion Card
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, and wait 10 to 20 seconds.
3. Open the computer cover .
4. Press the lever on the expansion card retention arm and raise the retention arm.
Expansion Card Retention Arm—Small Desktop Computer
NOTE: See " Expansion Card Cage (Small Desktop Computer Only) " for information on removing the card cage.
CAUTION: Before you perform this procedure, see " Safety First—For You and Your Computer ."
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 your
computer's illustration in "
System Board Components ."