The computer previously had Vista on it, so no need to tell you the specs. I know that I can run Vista. But, today when I formatted the HDD and installed a fresh copy of Vista, it would not boot. After the first post beep, it just stays on the flashing underscore in the upper left corner. What could be the problem here? I've already tried to re-install/format it again, and still the blinking underscore. It refuses to boot. Could it be that my RAM died?