Power supply could give the symptoms you described (occasional power-off when power level changes like launching a game) leading up to the final burn-out, which is often pretty stinky.
Nose around the actual power supply box, and you should be able to still smell the stench a little bit.
Make sure when you replace the power supply that you replace it with one rated high enough to power everything you have stuck in the box.
Nose around the actual power supply box, and you should be able to still smell the stench a little bit.
Make sure when you replace the power supply that you replace it with one rated high enough to power everything you have stuck in the box.