I have expected sudden shuttdown problems during playing games . Im quite possitive its not overheating problem i tried few stress tests. Its not blue screen it just shutdown itself and i can turn it on again without any problems.
Check out this article, it might help to determine if you are having overheating issues. Let me know how it goes.
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I have shutdown issues on m17x as well, however mine started happening after I installed new windows.
the display blacks out and the computer continues working(keyboard lights are on and alienware logo is on).
what is the definite solution to this.