I have an early 2008 Imac with an Nividia 8800 GS graphics card. It apparently failed two weeks ago, and I just got the machine back after the Apple Store replacing the card. The only graphical glitches I had on the Imac, was the faint line that would run across the screen that you could see on a white background if I left a program's window opened to long; and when using Safari, while encoding a dvd, trying to open up a new tab I would get images of whatever I was encoding in the new safari tab for half a second. Then it would correct itself and bring a blank safari page. No other graphical glitches until it failed, and wouldnt boot. Is this typical? They replaced with the same 8800 GS card, will this be a problem in the future?