I switch on computer, fans kick, lights flash briefly then everything goes dead. I've disconnected the power supply power leads to everything and shorted pin 14 to earth on the motherboard plug. Again power supply fan kicks briefly when power switched on then goes dead.
Yes, I've disconnected power leads to everything including the motherboard. On switching on the power supply fan kicks briefly and then everything goes dead. If I then immediately switch off and switch on again nothing happens. If I wait 10 seconds or so the fan will kick again when switched on.
OK that last trouble shooting list was very useful thank you.
I appear not to have the 12V line from power supply when the front panel switch is switched on. I do have the pre-switch on 5V to pin 14 of the MB connector which correctly drops to 0V when the front panel switch is pressed.
I think that means I could have either a MB or PS problem.
However when I pull out the MB connector, and leave two hard drives connected to provide a load, I get no 12V line either and the drives don't start.
I guess that means the power supply is shot unless both hard drives have gone kaput which seems unlikely.
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