Apple G4 manual Video

Troubleshooting Symptom Charts/ Video - 48

Video

Screen is black, but startup chime is present, drive operates, fan is running, and LED is l i t

1Check video cable/card connections and connector pins.

2Test with a known-good monitor. Replace the monitor, if necessary.

3Remove all third-party devices.

4Reseat the video card.

5Power Macintosh G4 (PCI Graphics): Check the jumper block at J25. Make sure the jumper is the correct color for the processor type, includes all required inner metal clips, and is installed in the correct direction. See “Processor Module” in Take Apart for more information.

6Clear parameter RAM. Hold down Command-Option-P-R during startup until you hear a second startup chime.

7Power Macintosh G4 (PCI Graphics): Reset the Cuda chip. See “Resetting the Cuda Chip” in this chapter.

8Reset the logic board:

•Power Mac G4 (AGP Graphics): Refer to “Resetting the PMU on the Logic Board” in this chapter.

•Power Macintosh G4 (PCI Graphics): Refer to “Resetting the PCI Logic Board” in this chapter.

9Replace the video card.

10Replace the logic board.