Last September my ~5-year-old desktop computer began running into problems when the motherboard stopped communicating with the hard drive. Fortunately I was able to back everything up; I bought a new drive and tried to copy everything over but for whatever reason the recovery always failed, so in the end I handed it off to a friend who installed Windows 7 on the new drive. For the past few weeks everything worked pretty much fine, and I could even read the old drive without problems. These past couple of days, things started getting screwy. Without warning, the monitor will cut to black and the fans will start whizzing as though it's rebooting, but it doesn't go through BIOS and in the end I have to shut it off manually. When I start it back up and log into Windows, the system clock has changed to the year 2000, some of the sidebar applications don't load properly, and at least half the right-hand taskbar icons are invisible and unresponsive. A manual reboot restores the icons and everything seems to work fine. At least until the next crash. Automatic restart is disabled, but I don't even get a blue screen; the computer simply seizes up. Anyone know what might be going on?