Well the beeps are telling you what's wrong with your machine basically. You really need a manual or mobo manufacturers website in order to retrieve information on Beep codes. What is your BIOS? Go into the BIOS and the type of BIOS you have will be at the top.
Here's a page of common beep codes.
The one you described is:
AWARD BIOS ERROR BEEP CODES
There are 2 main beep codes for the Award BIOS:
one long beep and two short beeps - Video error (reseat or replace video card)
two short beeps - Non-Fatal Error (reseat RAM, check other components)