MY COMPUTER KEEPS BEEP-beeping ON START UP.. WHY?

ANYBODY… I JUST STARTED UP MY COMPUTER AND IT BEFORE IT EVEN BOOTED UP IT STARTED GOING BEEP – beep – BEEP – beep – BEEP – beep… continuously.. I got logged onto windows fine and was able to open and close programs but the noise wouldn’t stop. I restarted it and it did it again. I shut it down and waited and then started it and it did it again.. I can’t get it to run without making that repetitive beep – beeping sound. one high pitched beep then a low pitched beep repeating itself. What do I do? It’s making me feel anxious just hearing it.. i don’t know if its a hardware or software problem.