IRQL not less or equal error... Options

[Jim]

So, I've got this problem with my computer. Recently, I opened it up and dusted it out (removing some things like my video card and memory and then reseated them). After that, I hooked it up to my TV using the S-Video slot (for some reason, my TV doesn't have a DVI slot, just a VGA). I go to watch a video and bam, Blue Screen of death. I try again, it happens again. So, I hook it back up to my old monitor and it's doing alright. Then, I start trying to watch videos again and I keep getting the blue screen of death with a message saying, "IRQL_NOT_LESS_OR_EQUAL" and then an address somewhere down. And, now, it won't even start up, unable to go through the startup process and a system restore won't take care of it.
From my research, it sounds like a driver problem but I"m unable to actually do anything with it at this moment... any suggestions would be helpful.