Exactly as the title says, my PC is now crashing a few minutes after startup every time I start it. This started occurring after I opened up my PC and cleaned a fan that was "squeaking" with a can of compressed air. I'm not particularly experienced with PC's, this is my first PC and I've only had this one for a year and a half, and I did not build it, but I'm fairly dang certain I put everything back exactly like it was when I opened it. Any ideas what the issue could be?