Ok, my friend is having a bit of a problem with his pc. A few months ago he was getting a similar issue, his screen was pixelated and went black after a while. I bought him a new graphics card (4870), psu (460w tagan) and 2gb more ram. However, just recently he has started to get that problem back. When he boots up it is ok for a few mins and then it starts to go all pixelated and he gets the blue screen of death and then it continues to restart. The 4870 has been fine thus far and has a good cooler on it, it might have came loose? Could faulty RAM cause this problem?