Problem finding graphics card hardware

Hi!

I own Alienware M17X R4.

Doesn´t work Nvidia graphic card G660M, I played and screen went blank and the computer restarted, after that the computer could not find the graphic card hardware anymore.  I have tryed everything, restarted the computer, took out the battery and so on, but nothing works. Can you adwise, what to do to fix the problem? Graphic card don´t list on the device manager or in the BIOS. I have read all the options, but non of them have worked for me.

Does anybody have a solution or should I take it to repares?

Thanks!