User Guide

10 - Power Mac G4 Cube Troubleshooting
Symptom Charts
7. Replace the hard drive. If symptom is resolved, update the ATA device driver and
install the Mac OS on the replacement drive.
8. If the symptom is not resolved, test the hard drive in a known-good computer. If the
hard drive works in a known-good computer, contact Apple to schedule a service
repair.
Power
Power button lights up when touched, but goes out as soon as you remove
your finger, and the computer does not turn on
During shipping the DC-to-DC board in the computer may move slightly out of its
connector. Reseat the DC-to-DC board in its connector.
Power button light flashes in sequence
Refer to the section earlier in this chapter "ROM and Processor Verification: Power-On
Self Test."
Computer is on, but randomly turns off or goes to sleep; computer is off, but
randomly turns on or wakes up
1. Make sure the computer is on a sturdy, flat surface.
2. Make sure there is nothing on top of the computer.
3. Check the settings in the Energy Saver control panel. The computer may be in sleep
mode according to these settings.
4. Verify the power adapter is plugged securely into the computer.
5. Verify the power cord is plugged securely into the wall socket and the power adapter.
6. Remove and reinstall the DC-to-DC board.
7. Check the year and work week code in the serial number on the bottom of the
computer. The serial number follows this format: PP YWW xxxxxx
• If the serial number shows a year and work week code of 035or earlier (for
example SG 035 MW6JDZ), go to the next step.
• If the serial number shows a year and work week code between 036 and 039 (for
example SG 036 MW6JDZ—SG 039 MW6JDZ), replace the power button gasket that
PP Plant or vendor designator
xxxxxx Unique base number and configuration