Quick Reference Guide

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Replacing the power supply
To replace the power supply:
1 Remove the side panel by following the instructions in “Removing the side panel” on
page 121.
2 For more stability, place your computer on its side. To avoid scratching the case, place it
on a towel or other non-abrasive surface.
3 Disconnect the power supply cables from all components (such as hard drives, CD or DVD
drives, and the system board), noting their locations and orientation. (You will reconnect
the cables after you install the new power supply.)
4 Remove the three screws that secure the power supply to the computer.
5 Slide the power supply away from the back of the computer, then pull it down and remove
it.
6 Install the new power supply into the case, then install the three screws to secure the power
supply to the case.
7 Reconnect the power supply cables using your notes from Step 3.
8 Replace the side panel by following the instructions in “Replacing the side panel” on
page 123.
Tip
You need a Phillips screwdriver to replace the power supply.
Screws