Power supply Ok.But CPU fans started with seconds It's stop.

Asrock PIV mother board with Intel CPU.When I switch on,CPU fan start.Suddenly stop.I check power supply by shorting 14 and 15 pins together.Then power supply switch on:then I check voltages orange 3.3.Power good line also ok.Then I decide power supply is good.Likewise problem may be in motherboard,CPU or ram.(On board VGA)IDE and all PCI cards removed.

Then I remove ram and switch on.CPU fan started then suddenly stopped.

I forgot tell you.If I switch on PC then fan started and stop nor,Again I couldn't switch on.If I press switch on button no result.Then I disconnect power supply cord from PC.Again reconnect and switch on then same result.CPU fan started again stopped.

So what do you think?Can you support me to get correct solution for this.I need to finalize problem in rams,mother board or CPU.

Bye
Narada Dilshan