Question Hardware beeps continues

[liakos]

My desktop do a continuous beep, I can't event count them it last for 15 seconds then shutdown. I change CMOS Battery re-seated RAM and worked. After a while I close the desktop then I go open again and does the same beep and duration and if put the second dimm of ram starts all over. Can this be power supply failure? Any tip before I head to service store?

 

[rgd1101]

check keyboard for stuck key?

 

[liakos]

check keyboard for stuck key?

I have checked all it can be externally (keyboard, mouse, peripherals) disconnected all. Also when I put the second dim of RAM starts all over. Now it's currently running with 1 dimm of ram.