sorry if this is the wrong section i wasnt sure where to put it.
I took my computer halfway apart, cleaned the cpu fan, took out and replaced a CD drive(the same CD drive), and put it back together, and now my computer restarts randomly(within like 5 minutes ussually). one time when it restarted i caught a glimpse of a blue screen of death. before it restarted. sometimes, it wont even boot(hangs at various times). Sometimes if i can get it started up, it freezes up(mouse, keyboard, everything) (one time when this happened a small black rectangle appeared on the screen).
I know restarting randomly is supposed to be a power supply problem, but i didn't even mess with the power supply. Ive reseated the ram. I'm thinking it might be the motherboard, (perhaps from ESD)? although i don't think i would have caused it. I did leave the room briefly and my dog might have sniffed it(unlikely he would actually touch his nose to it though I would think). Or maybe its the fan. I should have held it still, but i just turned it the way it had least resistance. So, what do you guys think
I dont have a lot of test equipment, so I'd like to know the most likely thing I should buy.