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Dell OptiPlex GX280 User Manual

Page 128

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4. Disconnect your computer and all attached devices from their electrical outlets, and then press the power button to

ground the system board.

5. Remove the computer stand, if it is attached.

CAUTION:

To guard against electrical shock, always unplug your computer from the electrical outlet before

opening the cover.

6. Open the computer cover.

NOTICE:

Before touching anything inside your computer, ground yourself by touching an unpainted metal surface,

such as the metal at the back of the computer. While you work, periodically touch an unpainted metal surface to

dissipate any static electricity that could harm internal components.

7. Remove any components that restrict access to the system board.

8. Disconnect all cables from the system board.

9. Before you remove the existing system board assembly, visually examine the existing system board to determine the

chassis configuration:

a. If a green tab is present on the front of the system board, your computer uses a metal tray to attach the system

board to the chassis.

NOTE:

If your original system board is attached to a metal tray, you will transfer the replacement board to the metal

tray before you install the new board. See

step 1

in the next procedure.

b. If a green tab is not present on the front of the system board, your computer uses a mounting plate to attach

the system board to the chassis.

10. Remove the system board:

a. If your system board is mounted to the chassis using a metal tray, remove the tray and the board as one piece:

Pull up on the tab and slide the system board assembly toward the front of the computer, and then lift the

board away.

b. If your system board is mounted to the chassis using a mounting plate, remove the system board and mounting

plate as one piece:

Remove the retention screw at the front of the computer.

Slide the system board assembly toward the front of the computer, detaching it from the hooks on the

floor of the chassis, and then lift the board away.