I have a dell inspiron desktop and it will not turn on at all. The model of it is D06M. It does not have a power switch on the back of it. The back light stays lit green when plugged in but when i press the power button nothing happens. I have tried the paper clip test with a safety pen i broke. When i put the safety pen in the green and black wires the green light on back stays on. when i plug it in the mother board with the safety pen the light goes off. What do I do? It doesn't show the dell logo on the screen.