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Troubleshooting Symptom Charts/ Video - 48
Video
Screen is black, but
startup chime is
present, drive
operates, fan is
running, and LED is
lit
1 Check video cable/card connections and connector pins.
2 Test with a known-good monitor. Replace the monitor, if
necessary.
3 Remove all third-party devices.
4 Reseat the video card.
5 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.
6 Clear parameter RAM. Hold down Command-Option-P-R
during startup until you hear a second startup chime.
7 Power Macintosh G4 (PCI Graphics): Reset the Cuda chip. See
“Resetting the Cuda Chip” in this chapter.
8 Reset 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.
9 Replace the video card.
10 Replace the logic board.