3783 Views 7 Replies Latest reply: May 11, 2007 9:11 AM by MGW
I have what sounds to be the same problem with my iMac G5 (20", 2ghz). I was hoping you had any additional information since your last post.
I have gone through 2 motherboard and 2 power supply replacements (the most recent one taking place this past weekend under the extended warranty program). The "freezing" problem didn't happen until approximately 8 months after the first mobo/ps replacement. Like you, I discovered booting in Safe Mode allows me to use the machine and as a result was able to salvage my data.
I was hoping the fixes last weekend would take care of the problem, but sure enough the problem returned immediately.
Oddly enough when I picked up the machine at the Apple store they had disabled Quartz Extreme. So when I sat at the Genius bar and approved the work, the computer ran fine. I re-enable Quartz Extreme when I returned home and that's when the problem started again.
Here is a link I found with instructions to disable Quartz Extreme from Terminal:
(instructions are located at the bottom of the page.)
I'm not in front of my iMac right now so I can't verify this isolates the problem, but you might want to try it out yourself.
iMac C2D 20" Mac OS X (10.4.9)