I left my computer on one time for a while, and when i came back to it, the screen wouldn't come on. so, i shut down the computer manually and rebooted. then, my hard drive tried to run, clicked a few times, and shut off. then, it said there was no hard drive. now, whenever i try to boot it, the same thing happens. i switched to another hard drive and installed windows on it, and it runs great. but, if i put the other drive on as a slasve to get data off it, the computer says that they are both missing, and i cannot access either one. whats going on?! a virus? what?!?!?!