pc won't start up

  vally 04:29 18 Dec 07

no probs in last 2 years since built, running xp-pro,suddenly--black screen while working--fans still running, shut it down using power button, now won't start up again,tried new PSU, HD, M/board, Processor, nothing works, tested s/w....there is power to the M/board because the power LED is on but the fans don't run now, also when the power button is pressed the green power light on the front of the pc comes on and then fades, also the red light flashes and then goes off, am thinking of shorting the 2 power s/w contacts on the m/board with a screwdriver so as to by-pass the s/w and see if that works
will go back over all i have done but would appreciate any new ideas

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