Recently I've been having problems with my 24" white iMac (late 2006) and hope that someone can help me. Basically my machine has been freezing intermittently necessitating a hard reboot. I can usually tell when it's about to lock up as some of the icons/windows on screen will begin to leave anomalous glitchy impressions on the desktop. I guess the best way to describe it is if I move an open window it will leave a partial "carbon copy" outline of that window on the screen and if I then move the window over that glitchy outline it will erase it however it will create a new impression as soon as I move it again. This will usually go on for a couple of minutes and then everything will lock up. I'll be able to move the mouse cursor however I can't interact as everything is frozen. As I said the only way out of it is to restart the computer with the power button. I've also noticed that the whenever I interrupt a screensaver or if I'm playing videos this also seems to bring on the freezing.
I was worried that it might be the graphics card or the logic board at fault so I ran a hardware diagnostic but no known issues were discovered. I'm not sure how thorough this test is at detecting hardware problems but if it is I'm a little relieved that it's probably software related... *Fingers crossed*.
I tried resetting the PRAM and that seemed to fix things for about a week or so but today the problem resumed. I have a copy of TechTool Deluxe that I will also run but I thought I'd first hit up this wonderful forum for some educated advise. Has anyone experienced this exact problem and resolved it somehow? If there's anything I can try, short of a fresh install, I'd really appreciate hearing about it!
2.16ghz Core 2 Duo
3GB DDR2 SD RAM
Nvidia GeForce 7300 GT
Snow Leopard 10.6.8
Thanks in advance guys!