OK, so I know hardly anything about computers, but my emachine desktop will start, go to the black and white screen where it asks how you want to start Windows, but no matter what I choose (safe mode, standard, etc.) it will start loading for a few seconds, go to the emachine logo, say something about the monitor power supply and then go back into that loop again. This will go on for hours in the same cycle. Any ideas of what to do?