User Guide

Power Mac G4 Cube Troubleshooting - 9
Symptom Charts
Flashing question mark appears on the desktop
1. Start up the computer from the Software Restore disc to verify that the hard disk icon
can be seen on the desktop.
2. If the disk icon is visible on the desktop, follow these steps:
• Update the driver with Drive Setup.
• Check the disk with Disk First Aid.
• Check for Mac OS software on the startup disk. Remove extra System Folders.
• Perform a clean installation of the Mac OS using the Software Restore disc.
• Back up all the data, and reinitialize the disk.
3. If the drive icon is not visible on the desktop, follow these steps:
• Reset Parameter RAM by holding down Command-Option-P-R when you turn on
the computer.
• Ensure all cable connections to the hard drive and the logic board are secure.
• Contact Apple to schedule a service repair.
• If the drive is not spinning, check to make sure the proper voltages are getting to
the drive power cable.
4. Remove the enclosure, and locate connector J2 on the DC-to-DC board.
5. Plug only the power adapter into the computer and turn it on.
6. Measure the voltages as shown in Figure 1. Pin 1 should measure approximately 5 V;
pin 4 should measure approximately 12 V. (Pins 2 and 3 are ground.)
• If the voltmeter doesn't show the proper voltages, replace the DC-to-DC board.
• If the voltmeter shows the proper voltages, go to the next step.