I have a Dell computer with an ATX power supply. This week when my wife started to use it and it was powered off. She leaves it on all the time. I looked at it and the start light was flashing. I pressed and it went out. I pulled power held power button and then tried to start up again. This time there was no light and never was a fan. I opened it up and the mother board light was on (I think this is probably showing 5 volts). I installed a new power supply and it acts the same. When I first pressed the power button the light came on but then went out. No fan in PS or on frame of computer. Any help??