Ok thanks, will try your ideas out.
frostbite...this is actually a problem that has occured before. My machine was originally equipped with 1gb of ram (2 x 512), i left my machine on overnight and found there to be a black screen. When i restarted, the screen was black, but with constant beeps coming from inside the tower. A good friend of mine discovered it to be a faulty RAM module (or so he believed) removed the faulty part (leaving just the 512 in) and it worked fine.
This time however, I am getting no beeps upon restart