HP Pavillion P6 desktop PC fails to boot

Hi,
 
 I have a HP Pavillion P6 desktop PC fails to boot. So I put a new power supply in it, but the same result. So I unplugged 4-pin auxiliary connector from the motherboard. Then I saw all the fans (CPU, 2nd fan under main PS, and main PS) rotating, but then still it did not go thru post-boot process. I heard the hard drive spinning but that is where it ends.
 If I plug  4-pin auxiliary connector to the motherboard, then I can't even get this powered on at all (in other words, the computer is dead quiet), let alone post-boot process.

 Should I throw this PC or is there something else that I can try at this point?

Thanks.
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sgleeAsked:
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dbruntonQuid, Me Anxius Sum?  Illegitimi non carborundum.Commented:
Try original power supply.  If all of the fans work work with the 4 pin connector removed then chuck the machine.

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sgleeAuthor Commented:
Can you explain to me what it means when the computer is dead silent when the 4 pin connector is connected to the MB?
As I understand it, the 4 pin connector is for CPU.
Is MB shot?
dbruntonQuid, Me Anxius Sum?  Illegitimi non carborundum.Commented:
Could be motherboard, possibly the CPU.  You'd test the CPU by replacing it with another.

You could remove the CPU and heatsink, reseat the CPU and replace the thermal compound on the heatsink.  Also check the plug and connector of the 4 pin and look for burn marks.

Also check motherboard for swollen or distorted capacitors.

But I'd suspect a short or earth in the motherboard somewhere.
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sgleeAuthor Commented:
I don't have the time to check CPU heatsink or reseat the CPU or the tools to check capacitors.
Based on your diagnosis, either CPU, one of capacitors or MB is shot.
That is all I need to know. I will chuck the machine.
noxchoGlobal Support CoordinatorCommented:
When you remove the 4pin connector and start the machine - what does it show on post screen? Which error?
sgleeAuthor Commented:
No message on the screen. No beep sound. Just fans make noise. I can not turn it off the computer b y power button. I have to unplug the power from the back.
noxchoGlobal Support CoordinatorCommented:
Ok, then the motherboard is bad. Replace it.
sgleeAuthor Commented:
Thank you.
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