A technician might be required to replace or install a power supply. Most power supplies can only fit one way in the computer case. Three or four screws usually attach the power supply to the case. Power supplies have fans that can vibrate and loosen screws that are not properly tightened. When installing a power supply, make sure that all the screws are used and tightened correctly.

To install a power supply, follow these steps:

Step 1. Insert the power supply into the case.

Step 2. Align the holes in the power supply with the holes in the case.

Step 3. Secure the power supply to the case using the proper screws.