nagi, that is an odd POST beep since you say that your computer functions normal. I suggest you download the service manual [https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=0ahUKEwiwhfOVpoTMAhWHOSYKHdHlDSIQFggqMAI&url=http%3A%2F%2Fwww.hp.com%2Fctg%2FManual%2Fc01035677.pdf&usg=AFQjCNFzln233nKlaWW6kLaiKy_dqVai-A&sig2=tyL7ZXBVKjeiYsW2pOe7RQ&bvm=bv.119028448,d.eWE|from here] and follow the flow chart on page 45. See what you find by working through it.
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