My home-built computer was running just fine until yesterday it just turned off and doesn't turn back on. The room temperature was about 20 degrees C, and inside the case it was much hotter when I took a look. I suspect that either the CPU or MB is broken. The MB shows it has power (on board LED) but nothing happens when I try to turn it on with the power button or try to "hot-wire" it. I don't have much experience with this, any "suggestions"?