[PCI] Dying monitor or video on 8500

[MikeRF/A2]

I have a 9 year old 17" Supermac monitor on which the screen suddenly 
goes to white/bright light gray with visible diagonal retrace or scan 
lines. Usually it does this after it's been on for at least 20 
minutes but sometimes within a few minutes of boot up. Even though I 
can't see what I'm doing at that point, I can use keystrokes to save 
open docs, close windows, quit programs and shut down the 8500 
G3/350 computer.

Turning the monitor off for some time (to cool?) usually allows  it 
to come back up later. Generally, rebooting does not fix the problem 
although it has worked on one or two occasions making me think 
there's a slight chance it's  the built-in video on the 8500. I am 
not using a video card. Seems like bad video from the computer would 
cause a black or dark gray screen though?

Can anyone diagnose these symptoms?
Thanks- - Mike (formerly [EMAIL PROTECTED] email)
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