My HP Compaq dx2310 microtower isn't able to boot, it has no signs of receiving power. no lights on the back/front, fan doesn't spin. I checked if the surge protector is giving power and tested it. It did. Same thing on the wall outlet, it still has power. There are no loose connections, so it must be the power supply is dead. How do i trouble shoot if the power supply is causing the problem or a different part of the cpu?