If your not getting anything on the screen and when you were it was restarting before windows booted or you had to hit the Power button about 10 times to get it to boot I dont really think its a software or driver problem
Ahhh, I was reading/understanding that as meaning it would POST, then get funky, not get funky from the get-go. In that case, yes, software would have nothing to do with it.
How old is the MoBo? It's possible that could be the culprit, too. The thing with on-line diagnosis and troubleshooting is that a certain amount gets lost in translation sometimes. It's nobody's fault, it's just easier when you're holding/looking at parts/the system as a whole to play with what-if scenarios. I, too, hate to randomly suggest parts to replace, but in this case, since everything else up to this point has yielded no results, yeah...
As mentioned, the video card and newer, more capable PSU would be the logical first choices, since both are easy to swap out. If nothing comes from them, I'd suggest a new MoBo.