Troubleshooting System Problems After Startup/Garbage Video - 45
Garbage Video
“Garbage video” refers to erroneous text or characters that appear on the screen.
Possible Cause Possible Fix
Corrupted system soft-
ware.
Boot from the system CD that came with the unit. Open
the Monitors and Sound control panel and change the
Maximum Resolution and Color Depth to their maximum
settings. Restart the unit. Does the screen display appear
normal now?
Yes: Reinstall system software. (You must use the
system software CD that came with the unit to get the
correct version of Mac OS 8.1 with the appropriate
iMac enablers.)If the problem persists, go to the next
step.
No: Go to next step.
Bad VRAM. Remove any VRAM DIMMs and restart the unit. Does the
screen display appear normal now?
Yes: Replace the existing VRAM DIMMs with known-
good VRAM DIMMs.
No: Go to next step.
Bad logic board. Replace the logic board.
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