Power Mac G4, Power Mac G5: Computer restarts after being shut down

A Power Mac G4 (Mirrored Drive Doors), Power Mac G4 (FW 800) or Power Mac G5 computer may restart after the computer has been shut down when it is connected to certain third-party VGA and DVI displays using the DVI connector on the computer.

Symptom

The computer restarts after it is shut down. This occurs when certain third-party VGA and DVI displays are connected to the computer's digital video interface (DVI) port.

This does not affect displays that use the Apple Display Connector (ADC).

Solution

Although rare, some third-party displays deviate significantly from the industry design standards for the implementation of the DDC (Display Data Channel) clock signal.

If your computer restarts after shutdown or wakes after being put to sleep with certain displays connected to the DVI port, these symptoms can be prevented by connecting the display to the video card's ADC port instead of the DVI port.

It may be necessary to purchase an ADC to VGA or ADC to DVI adapter cable. Companies offering ADC to VGA or ADC to DVI adapters include:

Once you have an adapter:

1. Disconnect the display and any adapters from the DVI port on the back of the computer.
2. Connect the appropriate ADC to VGA or ADC to DVI adapter to the ADC port on the back of the computer.
3. Connect the display to the adapter cable.
4. Turn on the computer and verify that it starts up correctly.
5. Choose Shut Down or Sleep from the Apple menu and verify that the computer responds correctly.

Important: Information about products not manufactured by Apple is provided for information purposes only, and does not constitute Apple's recommendation or endorsement. Please contact the vendor for additional information.

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