It's very probably a video card failure. The machine beeps a certain number of times when you turn it on as a code to say what is wrong (if anything). One beep is "all okay". Most errors appear on the screen, but if it can't talk to the video card, that would be kind of pointless. Try pulling out the video card and putting it back in. It may have slipped and some of the pins had disconnected or crossed. If that doesn't fix it, see if there's any obvious damage and claim it on waranty.
