So I just fixed my recently built computer. The motherboard was damaged so I had to get a new one, and I installed the new one just fine. Everything was running a lot better than before but all of a sudden a couple of hours in, its having problems starting up. I just had to do a system restore because it wouldn't even show any icons on my desktop or my mouse. Sometimes it would show the "starting windows" screen, and then restart itself. Any ideas what might be causing this? I have Windows 7.