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Tried changing the bios version? Maybe you are using a dodgy version

Yep I've ensured it was updated. Quick update, while playing Half Life 2 I experienced the same crash. The game crashes with looping audio then when you go to alt tab the pc crashes/ becomes unresponsive. I'm redownloading TF2 onto my other ssd to see if maybe that will fix it.

I had that problem.
When i launched skype, browser, and tf2 together my system crashed.
The problem was my 4GB RAM.
Not sure about you.