Whenever I play games on my SAMSUNG X20 (with an ATI Mobility Radeon X700) (GPU:351 MEM: 331 all @ stock) the display suddently goes blank when it starts to render 3D images on the game. Ive been trying to underclock it (GPU and MEM using popular overclocking software) under powerplay's high performance mode (since when I put it in balanced, the laptop halts) but still, it sticks to the stock clocks, but when the mode is in balanced, everything's fine, but the framerate of the game is too slow. I have been alleviating the GPU by putting more thermal paste onto the heatsink and the copper plate of the GPU with no luck. Is there any way to finish this problem once and for all, without affecting the full power of the card? Thanks!