...for at least an hour. I recently had the problem of my computer shutting itself off after being on for a few minutes. I fixed it by blowing the large amounts of dust that was clogging every fan in the computer. I used a can of spray air and cleaned out the fans on my video card, processor, and opened up my power supply and cleaned it out. Everything seems to be pretty clean now. That fixed the problem of it randomly shutting off after being on for a few minutes. Still, when I have my computer on for a little while then shut it off, it won't start back up. It will sound like it's making attempt to start up. The fans will start moving, but then after about 2 seconds, it all powers back down. Any help would be appreciated!