Hello everybody. I have a desktop and monitor running Windows XP Professional and recently I've been having troubles with it. When I start up the computer it pops up a black screen with a white underscore flashing and I can't enter anything. It only allows me to go into f2 and f12 to see my BIOS settings but when I repeat f8 to go into safe mode but it just makes a beeping sound and safe mode doesn't pop up. Does anybody know what I should do?