Dell OptiPlex GX1p - Manual (Page 8)

To access some components on the system board, you may have to rotate the system power supply out of the way. Use the following procedure to
rotate the power supply:
1. Remove the computer cover as instructed in " Removing the Computer Cover ."
2. Disconnect the AC power cable from the AC power receptacle on the back of the power supply (see Figure 8).
Figure 8. Rotating the Power Supply
3. Free the power supply from the securing tab labeled "RELEASE —>, " and rotate it upward until it locks in its extended
position.
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CAUTION: Before you remove the computer cover, see " Safety First — For You and Your Computer ."