Unstable Alienware Aurora-R4

Hello people

I bought an Alienware Aurora-R4 two month ago an everything was running fine until two night ago.

The problem is that the computer seems to freeze completetly and does not answer to any input. Screen stay's still (displaying the image at the moment of the freeze), keyboard seem's jammed and mouse does not answer.

There's been no new software installed on my computer, except Diablo 3 a month ago, and my computer is fairly protected behind antivirus (Mccaffe...I know it's not the best, but still).

From windows logs: nothing. I have no special logs at the moment or right before the crash. Only error log appearing are the one created at the reboot, stating that the computer shutted down unexpectectly (No kidding, I have to do a cold reboot every time).

Does anyone experiencing the same issue, and if so, any recommandation on how to solve the problem?

Thank you :-)

Loïc Lavoie