For like a year now my computer has been acting up. It was working perfecct before but then it suddenly started shutting offafter a while. I couldn't figure out what was wrong with it but then I wiggled the VGA wire and it started working again. This went for about a week.After this wek was up it would start up snf once the vista screen appeared it just shut down. I think it might be the power supply because I heard somewhere else that the power supply can sometimes overheat over a long period of time from being too dusty. For a while I thought it was the graphics card because I had wiggled the VGA wire before and it worked. But the graphics card seems fine and has been cleaned. If anyone needs more information or pictures of it just ask. Thank you in advance for any help you can provide.