I have a HP dv2700 special edition laptop. I was playing a game and it froze and had little patches of green lines across the screen. Then it unfroze and I kept playing the game. Then it happend again and I tryed rebooting my laptop and the screen was blank. I replaced the lcd screen, but that did not fix the problem. The backlight works. Could it be my graphics card? Or something simple? please help Thank You.