Backstory: a few nights ago my wife's computer started to blue screen while playing WoW. I was thinking it was an overheating issue so we took it apart for spring cleaning and put it back together again. It still blue screened, and then the next day it wouldn't even go to POST, I couldn't even get the video to register. I removed everything, even swapped power supplies, pulled the video card and went to the onboard. Nothing worked. I took the hard drive as someone suggested and put it in my PC and scanned it and it seems fine, though it had already been unplugged so couldn't be the issue.
So... Whether incorrectly or not I purchased a new motherboard and installed it. Now it can post, however now I get a blue screen soon after Vista begins to boot. It won't even boot into safe mode. I've tried researching the problem but answers are ranging from delete certain files to the HD must be bad. So I put it back in my PC, did the longer disk check, and even tried to use it to boot from my PC and it's still failing, and not even a restore is helping. It either stops at AVGIDSEH.SYS or CRCDISK.SYS, but I'm beginning to think neither of those files are actually the issue.
My next step was going to be to try and just reinstall Vista, but I have the upgrade version and it seems it will only allow me to start the process from within windows. But even if I found a way around that, I don't want to just do that if the HD really is bad. But what are the odds of both the MB and HD going bad exactly at the same time?
Any ideas would be most extremely helpful at this point.