Picked up an 800mhz G4 iMac, traded my Nano Touch for it. I have been looking for one for awhile. Seems to work great, even with 512MB of RAM. But, after it is on for awhile, the display gets corrupted, and it will not wake from display sleep. Once it's rebooted it will not boot past the blue screen and mouse pointer, which is corrupted. Sometimes it gets vertical lines and sometimes it's just a corrupted cursor. If I let it sit for a few hours, and cool down, it goes back to normal. Is there something that I can do about this? I have a tube of Arctic Silver, is there something that needs to be re-coated properly? Or is this just going to get worse? I'd love for this to be reliable, I'm going to use it as a bedside alarm clock/jukebox, as it's compact enough to be useful for just such a purpose. Otherwise it'd just sit in my basement and look cool.