Any particular pattern to the beeps - each pattern has a different cause
http://www.computerhope.com/beep.htm#04
This happened to me the other day, my daughter was playing "memory intensive" games and it just started beeping, even when I tried to restart - although a simple soplution I just switched everything off , unplugged everything, gave it 5 minutes and all was OK, hopefully its something as simple as that ?hasnt happened since (apart from me banning her from going near it :-))