Every now and then, my PC would act is if it hard rebooted/crashed. That is all the monitors would go black for an instant (I have 3 connected), the PC would beep, and I would see the BIOS flash. I would curse thinking I lost all my work since my last save. But the really odd thing is after a second or two, instead of seeing the Windows login screen like would happen in the case of a BSOD, instead I would be back on my desktop, with all the Windows opened exactly how they were. This happened once while I had a game running on one screen and I was writing an e-mail halfway on another. When the Windows re-opened, the game was still running, the e-mail was still open to exactly where I was typing. If I had turned my back for a few seconds when this "reboot" happened, I would never even had known it occurred. This happens rarely, maybe once a week, but it freaks me out when it does happen. Why is this occurring, and what exactly is happening?