Hi, I have a XBOX original. Not 360. It is not turning on. No light. Its dead. So i removed the power supply board from it and I inserted a LED in orange (3.3V) and ground. Then I shorted White pin(PS_ON) and ground (Black). LED did not glow. I even tested with multimeter after shorting it. No luck. Now I wanna know if this is a right way to test the power supply? And how do I find out whch component is defective? pls help me.