Either you can find your hardware manual/manufacturers website and look up the beep code (probably faster than waiting on a response) or if you can tell us what motherboard you have (or make of your compter, Dell, HP/Compaq, etc) as well as describe the beep pattern as suggested above and someone will look it up for you.
Assuming the computer was working before you installed the new ram, you've probably not got it in all the way, try reseating it. If it wasn't working before it could be anything and the beep code is the only way to know.