I've had my white macbook since october 2009, and two days ago when I opened the lid, it was completely dark. (I had been using it 10 minutes previously with no problems) After a while, I could just about see my desktop, but the screen was still very much black. I turned it off and left it for a while and when I turned it back on it seemed to work. However, since then the screen has continued to go dark, firstly when I'd turn it on but now in the middle of using it. I read on some forums to try and turn the screen down to the bottom (f1) and then slowly increase it using f2. This has seemed to help, but If I attempt to turn it up to its maximum it goes dark almost immediately after. Does anyone know what this means and what I should do? Thanks very much.