Ps-on signal alone to start the power supply, then there is a trip, who help analyze what is the reason!
Eliminate the power problem, it is certainly the motherboard problem.
Your computer with how much time, or how much time did not clean up the dust, and may be a short circuit into a place, mainly the power and the motherboard dust clean up
I used to encounter a machine for a long time useless, boot it is no problem, but plug in the test card power to smoke, and unplug the power can be used normally, still depressed
