My computer has developed a very wierd problem over the past few weeks. It started with my previous power supply going to hell. It lasted for about 4 years, and I've made several upgrades to my computer since. The power supply was 250 volts, and I just figured, about time, right? Wrong. I purchased a new power supply, a substancial increase in power of 580 volts. Like before, my computer will shut down after about 45-60 minutes of being on, and if not shut down, lock up completely. However, the computer turns back on after I hit the button. No problems, no errors, no viruses, no spyware. I've monitored the computer's temperatures, and noted the last shutdown tempature, not even close to over heating. I'm sure it has to do with something hardware, or maybe the way the powersupply's plugs are set up? Not sure what to do next, just a bit of help would be greatly appreciated.