I have a Asus g73sw. When I try to play wow or any games for that matter, my screen will flicker and turn black. When I hit Alt+F4 or Ctrl+Alt+Delete it will turn the screen back to that I can see it.

This issue isn't happening on any external monitors or when I don't have the computer plugged into the power supply.

I have been told that these are/may be the issues and was hoping that someone might be able to give me insight on the problem:

Bad GPU(460M)
Bad Motherboard(though computer works for everything but games)
Bad Power supply(best buy did the test so I'm not to confident that it was accurate)
Bad screen connection( though again works with everything but games)

I just want to see if anyone may know the issue before I take it apart and try to spend more money then need to fix it.