I have the same problem, my laptop hanged while I was watching video, the screen gone green and totally hanged, not even ctrl+shift+del worked. I have to force it off by pressing power button. After I restarted, I could see there is light from LCD, but totally nothing shown, even until I heard the sound of windows started, not even BIOS could be shown. I still could adjust the brightness of the LCD.
I have tried the above ways, but I could not even see the BIOS screen, & even after the power-cycle, the problem still exists. My service tag is 4MZPV1S.
Please help me Timmah~!