About 2 months ago I opened up the case of my comp and cleaned all the dust out. WHen I go to turn it back on it doesn't turn on. I kept trying it and like an hour later it worked. It has been working fine until today when I installed a new Hard Drive. I am 97% positive I didn't fry anything. I am thinking it is something in the PSU but I don't know.Anyone know how to fix this so it doesn't happen everytime I do something to my computer?