When i turn the computer on it will go all the way to login, then it will log off, save settings, then try to login again only to log off. I have set the computer to automatically login where it has been doing fine for a year, nothing has been changed. Trying last good config made it even worst, after loading windows a get a screen full of colors, like a bad VGA card. Going to safemode gives the same login log off loop. Anyone know what could cause this?