On Sep 18, 2010, at 10:05 PM, muttdog wrote:
Okay... tonight I had some time to play with the G4. On your
insistence I disconnected the optical drive and booted it up.
Same results with the exception that the screen
actually displayed distortion when it froze.
First time I've seen that and seems to
confirm that it suffers from the infamous video chip issue.
I've had little experience with G4 iBooks, but I have a lot of
experience with G3 iBooks that suffer from the graphics chip issue. I
don't think your problem is the graphics chip issue. My iBooks that
had this problem would all boot fine without freezing at all, they
just had screwed up display which made any usage nearly impossible. If
you pressed the correct keystrokes, you could still Shutdown or
Restart or do anything else because the iBook was acting normally
other than the display issue.
In my experience the causes of freezes that are most common are:
1) bad RAM or mis-seated RAM
2) bad HD (especially if the fan has died)
3) hardware issue or short (logicboard, optical, ports, etc)
4) software (easy to test, boot known good system or CD)
I may be wrong about the graphics chip issue, but it surely is much
less common in the G4 iBooks than the G3. If you shim the chip and it
fixes the issue temporarily, then perhaps you're correct, but I'd look
at RAM, HD, and all other possibilities before concluding that the
graphics chip is the problem.
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