|As I stated in #1, you have to check all the components by connecting them one by one and checking, whether it works.|
BTW: If the power supply went in to it's short-circuit-protection, you have to power off the computer and wait for about 2 minutes, to be able to try other components.
One can hear a low noise ticking, when the power supply went into it's short-circuit-protection.
The original poster should always write the last response !!!
Let us know, if the problem is solved !!!