Try clearing the CMOS with the jumper.
If you are running 2 or more sticks of RAM, you can try one at the time.
I would suggest inserting one stick, and if you still get a beep, remove it and switch to the other. (assuming you have more then one.)
It is unlikely both sticks failed, so if you still have a problem after trying them one at a time, you may have eliminated one possibility.