Dell Precision 420 - Manual (Page 89)

To return the power supply to its original position, perform the following steps.
1. Rotate the power supply to its original position and hold it there (see Figure 14).
2. Rotate the power supply release handle towards the back of the system until it is closed.
Make sure that the handle latches onto the power supply properly and the power supply slides slightly to the back of the system and locks in
place.
3. Replace the cover .
4. Reconnect the AC power cable to the AC power receptacle on the back of the power supply.
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1
Power supply release
handle
2 Power supply