Hi there. My friend has the 24" white, 2.16Ghz iMac - spec: http://www.everymac.com/systems/apple/imac/stats/imac-core-2-duo-2.16-24-inch-specs.html He is currently running a fully updated install of Tiger, and running EyeTV v2.5.3 and VLC (unknown version). Here are the problems being exhibited: 1/ When EyeTV is running, it will sporadically, and unpredictably, crash without explanation. 2/ Many times, the iMac will not even boot - it gets so far @ the grey screen, and then the "Please restart your computer" screen pops up: 3/ Also, when using either VLC or EyeTV, sometimes there are patterns of green *horizontal* lines, spanning the area of the video playback window (NOT the entire iMac screen) - this happens a LOT. I have booted in safe mode, verified the volume in Disk Utility, repaired permissions, and it still exhibits these same issues. Also, EyeTV will freeze when displaying video, quite often. Before I waste any time pursuing graphics updates, or wiping and upgrading to Snow Leopard for my friend, I am wondering if this is an issue experienced by anyone else with this model?. Google throws up a LOT of "green line" results, but I wanted to be extremely specific, to narrow this down a little. I do hope this is not a job for Apple repair - is there anything which I may do to eliminate certain things?. Many thanks!