I was playing tf2 today when my computer suddenly went to power saving mode and then restarted itself. I didn't think much of it, and started playing again. A while after, it happened again, although the computer did not restart and I could still hear my friend on Skype. The power button wouldn't do anything and nor would the keyboard, so I had to switch it off by the plug. Both times this happened one of my fans went really loud. This has never happened before so I'm quite worried I broke something.
You can find my pc specs here: http://uk.pcpartpicker.com/user/tmac24utm/saved/2q3z I also have an ssd(with my os on) which is not listed there.
Thanks in advance