What bios does that board have? have you identified the beep code? Bios Central with beep codes.
Did you buy recommended/compatible ram
More information would be of help diagnosing your problem
EDIT: AMI Bios - 6 short ..... Gate A20 failure ...... The keyboard controller IC has failed, which is not allowing Gate A20 to switch the processor to protected mode. Replace the keyboard controller
Is your new keyboard usb? try a ps2 keyboard instead (old style plug, not play station
) though with it saying controller I am guessing (note guessing as I am not familiar with this board) that there is a replacable IC on the board.