Er-290 wont stop beeping

Step 1:
The beeps are post during post the very first work is done by the ram, all the memory in the ram is first transferred to the hard disk, and remains 1 short beep : Normal POST - system is ok
2 short beeps : POST Error - error code shown on screen

No beep : Power supply or system board problem
Continuous beep: Power supply, system board, or keyboard problem

Repeating short beeps: Power supply or system board problem

1 long, 1 short beep : System board problem
1 long, 2 short beeps: Display adapter problem (MDA, CGA)
1 long, 3 short beeps: Enhanced Graphics Adapter (EGA)
3 long beeps : keyboard card http://www.pchell.com/hardware/beepcodes.shtml