I've just about had it with my Alienware M17x laptop, and the Alienware Tech support "professionals".
I've been experiencing random shutdowns starting from the second day I owned the laptop (November, 2014), and occurring at most about once a week, and as frequently as once a day. I will be in the middle of browsing the internet, and the screen will go dark, the keyboard lights will go out, and I hear the fans wind down and the then the power button light will go dark. I don't get the typical Windows "Shutting Down" black screen, it just powers down all within about 2-3 seconds. It has even happened to me at the Windows Login screen, where I put in my password to log into Windows.
Suspecting overheating as the issue, Alienware tech support ran some benchmarking tests and determined that the processor was overheating (was reaching about 105° C), so they sent a technician to replace the heatsink and fan. It doesn't overheat now during benchmarking. But I'm still experiencing shutdowns, and now, I'm experiencing strange behaviors with my video card.
I have an AMD R9 M290x, and I can switch to the onboard graphics (on the motherboard) by pressing a key on the laptop and restarting. But now, when I do this, the computer restarts and throws errors at me saying the AMD card is not installed, or that the driver needs to be updated (this never used to happen). I wanted to try and just use the onboard graphics in order to try and determine if the shutdowns were caused by the AMD card, but now I'm getting a bunch of blue screen errors. I don't know what to do at this point, if anyone has any ideas, I would be grateful. Not sure if there are two separate issues here, or if they are related.
This is my first time posting, so I'm just posting the info below based off of what I've seen on other posts... Let me know if any other info would be helpful.