My computer suddenly shut off completely about 2 weeks ago. Then I couldn't turn it back on. In frustration, I repeatedly pressed the power on button and lo and behold, about 30 seconds worth of pushing the button convinced it to come back to life. Then oddly enough, ever since then, the computer has been shutting off completely at random intervals and after about 30 seconds of pushing the on button, it powers up. Sometimes for 30 seconds, sometimes for up to a day. Very, very odd. Then lately, it has been giving a disk check before entering windows. No bad sectors at all so can't figure what's going on. Any hints? I've checked all power connections, sniffed around for any power problems but can't figure out anything. It worked fine for about 6 months but suddenly this odd problem.