Well I'd think that the most common reason that might happen (and probably the easiest to fix!) is that the ram is either bad or not seated correctly. Try pulling the ram out, blowing out any dust, and reseating it. Might want to try the same with the video card.
Another thing, check your GPU and see if you need to plug in any additional power input from the PSU.
I can't find anything saying that your GPU has a buzzer, so my guess is the beeping you are hearing is from the motherboard, not the GPU. That doesn't necessarily mean that the GPU isn't causing the beeping though. Have you messed with the voltage on the GPU?