Troubleshooting Video

From Applepedia

If the Mac gets power, but doesn't display any video, there are a number of things that could be wrong.

Contents 1 Video card 1.1 Built-in video 1.2 PCI/AGP video 2 Monitor 3 iBooks

Video card

Built-in video

• If you have a beige Mac, make sure the backup battery is good. Many old Macs refuse to show video when the backup battery is dead.
• If you have a beige Mac with upgradeable VRAM, some of it may be improperly seated, or has gone bad.

PCI/AGP video

• Make sure the video card is seated properly.
• Make sure the video card works, and is a Mac video card (PC cards that haven't been correctly flashed with a Mac ROM don't work). Try a known-good video card.

Monitor

• Make sure the monitor works.
• Mac OS 9: If the video works at start, but then turns off as extensions load, you've set it to an invalid resolution. Reboot with the shift key down, and then trash the "Monitor Preferences" or "Display Preferences" file.

iBooks

• You probably have a faulty Logic Board. Phone fruit.
  • Expanded iBook Logic Board Repair Extension Program