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Power Mac G4 Power Supply -

7. Unplug the power cord.

8. Lift the latch on the right side access panel.

9. Gently lower the access panel until it lies flat. To avoid scratching the case, lower the

panel onto a soft, clean cloth.

(Figure 2)

Warning: If you see any lights glowing on the main logic board, the computer
has not been shut down. Close the side access panel and shut down the
computer before proceeding.

Removing the Installed Power Supply

Warning: The power supply is a high-voltage component. While you may
remove the power supply from your computer, you should not open the power
supply case for any reason, even when the computer is off.

1. With a Phillips scewdriver, remove the three screws that attach the CD/DVD drive

carrier to the chassis.

(Figure 3)

2. Supporting the bottom of the carrier, slide it back and rotate it so you can reach the

drive cables.

(Figure 4)

3. Carefully detach the ribbon cable tape from the top of the carrier.

(Figure 5)

4. Disconnect the following cables from the back of the CD/DVD/Zip drives

(Figure 5)

• ribbon cable from the CD/DVD and Zip drives
• power cable (P6) from the CD/DVD drive
• power cable (P7) from the Zip drive

5. Remove the carrier and drives from the computer.

6. Press the small locking tab on the power-to-fan cable connector and disconnect the

cable.

(Figure 6)

7. Disconnect the main power cable from the logic board and the power cable(s) to any

hard drives.

(Figure 7)

8. Remove the four screws that attach the power supply and main power supply cable to

the chassis.

(Figure 8)

9. Using a 2.5 mm Allen wrench, remove the three screws on the rear panel.

(Figure 9)

10. Slide the power supply toward the front of the computer until it clears the security bar

on the upper inside corner of the chassis.

(Figure 10)

11. Maneuver the power supply and its cables out of the chassis.

(Figure 11)

Installing the Replacement Power Supply

1. Remove the two bracket mounting screws on the original power supply, transfer the

bracket to the new power supply, and secure it with the same two screws.

(Figure 12)