Everything you describe sounds like voltage problems. Your Mac is out of whack. Get yourself a multimeter and go to work, starting with Dr. Lee's excellent notes. Then get yourself…
68kMLATroubleshootingby Mac128Mon, 31 Aug 2009 - 17:09
Is everyone 100% sure that these machines cannot go up to 1 Gig of memory?
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Unfortunately since the beige G3s only have 3 slots, yes.