Specifications

Power Mac G4 (Mirror/FW800) Troubleshooting - 17
Symptom Charts
System shuts down when using multiple FireWire devices and an Apple ADC
17" CRT display is connected
The power requirements for multiple FireWire devices and the Apple ADC 17" CRT display
may exceed the capacity of the power supply, causing it to shut the system down. To
alleviate this problem, do the following:
1. Reduce the number of bus-powered FireWire devices
2. Use a power adapter with all FireWire devices
3. Reduce monitor power draw by reducing brightness or reducing the amount of white
space (open text documents, for example).
System quits or stops responding intermittently
1. If the system quits or stops responding in a specific application, force the application
that has frozen to quit:
• In Mac OS X, choose Force Quit from the Apple menu and select the application.
• In Mac OS 9, hold down the Esc, Option and Command keys and click Force Quit
in the dialog box.
Replace the application. Verify the application is compatible with the operating
system.
2. For a suspected software problem,
• Use Software Update to ensure that the computer has the latest drivers, bug fixes,
and other updates.
• For problems with software from a manufacturer other than Apple, contact the
manufacturer.
3. Clear parameter RAM. Hold down Command-Option-P-R during startup until you hear
a second startup chime.
4. Perform a clean install of system software with the system restore CD that came with
the computer.
5. Run Disk Utility.
6. Replace the DIMMs one at a time and test until all bad DIMMs are replaced with
known-good modules.
7. Reset the logic board. Refer to “Resetting the PMU on the Logic Board” in this
chapter.
8. Replace the processor module. Refer to "Before Replacing the Processor" in this
chapter.
9. Replace the logic board.