Was using my ASUS ROG G20 to play some Dark Souls (a fairly common occurence, and not an intense segment of the game, so I'm certain the pc could handle it) and listening spotify when my pc fully powered off without warning, as if the plug had been pulled. I've checked the outlet and the power strip I was using, both work. I have no real way of testing the external power supply (it's a prebuilt, it runs off 2 power bricks that plug into the back), and there are no signs of overheating/ no frazzled electronics smell. What should I buy to troubleshoot this thing, or is it already a lost cause?