Its been about a year and a half since I bought my computer... For the past few months, every once and a while, whenever I would boot it up, then get the to Welcome Screen, my computer would restart without warning and give me an "Serious Error Has Occurred" message back when I'd get back in Windows. I asked one of my very knowledgable teachers at school today whether it was a video card problem or a RAM problem, and he said it was very possible that it was a RAM problem. So what I'm asking is whether you guys think its a RAM or video card problem. I don't have a problem with either the RAM or video card being replaced since my computer is still under warranty! So, any ideas?