try replacing the video card, there are two reason why the cpu make sound, the beep, beep, beep is for memory/ ram and the other one is the video card, the sound is different from the sound of the memory, you said you checked the memory now try replacing the video card, if im near your place i rather go there and help you,but im too far,if you got time try visiting this one.WE DO NOT SPAM IN THE FORUM