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Troubleshooting Symptom Charts/ Video - 4 9
Screen is black, there
is no startup chime,
and drive does not
operate, but fan is
running and power
LED is lit
1 Power 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.
2 Check all video cable/card connections and connector pins.
3 Power Macintosh G4 (PCI Graphics): Reset the Cuda chip. See
“Resetting the Cuda Chip” in this chapter.
4 Reset the logic board:
• Power Mac G4 (all models except PCI 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.
5 Reseat the video card.
6 Reseat the processor module.
7 Replace the processor module.
8 Replace the logic board.