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Message: <blockquote data-quote="waiton" data-source="post: 784742" data-attributes="member: 47001">Well, it froze in Leopard as well. So I've done another fresh install of Tiger (reset PRAM, SMC) and still have the pixel glitches and freezing every hour or so. Also found the apple forum posts:<a href="http://discussions.apple.com/thread.jspa?threadID=1467276&tstart=30" target="_blank">Apple - Support - Discussions - iMac Freezing ...</a>From the looks of things it's an overheating problem with the graphics card which in turn burns out the card & logic board. Hopefully I can get it repaired quick as because I need the machine for freelance work! I'll be dropping it in for sure on Monday.</blockquote>