No Input Signal, Keyboard Power

Hi everyone I have a HP m8200n Pavilion. Motherboard is HT2000.

It has not been able to boot up, no power to the keyboard or input signal. I do hear the hard drive spinning. I've done everything I possibly can and read everything I possibly can.

I turned it on disconnected power to Mother board. Unplugged major power suppy and green light is still on Mother board. I let it set for 10 mins and green light went out. Then I plugged power to motherboard then main supply and keyboard lit up briefly I was pressing the F10 button to get into the Setup and everything died again.

I really don't know what to do. Please advise.

Thanks so much!!!
 
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