I purchased my first Mac in July, a 17" MBP, to be my desktop/mobile computer. It's been great until recently I've noticed that sometimes when I watch a video on hulu, for example sometimes the website freezes on the screen and then the whole computer pixilates or just becomes a bunch of multi-coloured squares. If I restart Safari the web works but there are still pixels covering my desktop. I took my computer into the Mac store when this happened and they said it was the Logic Board, and replaced it. Later the same day I got it back it started doing it again. My guess is it isn't the Logic Board. Has anyone had this issue or a clue as to what it might be so I can go back to Mac and say try XYZ?