the psu is the one which came with my antec micro fusion case... tbht the overheating problem was probably due to the fact that the 4550 was getting a bit toasty in there and in turn heating up the other components, I mean i've been using my htpc since i think last september and its never happened before so I'm guessing it was that... the drivers are the latest as well but I doubt I could rma a motherboard from last september on account of it wont play 24p in sync... gonna install vista tomorrow and see what happens...