My hp Pavilion p6230y died. It will not boot. The power button LED does not lite.

The power supply LED is lit, and all the voltages are correct (metered). The fans turn on when the power button is pressed, and I can feel the HDD turning and it gets warm. I stripped the system down to bare essential, nothing but wireless keyboard & mouse, HDMI connector to monitor. I cleaned out all the dust from inside the computer.I reseated the CPU chip. No beeps at all coming from motherboard. The CPU heatsink is stone cold. I suspect either CPU chip &/or motherboard. Anybody have any ideas?
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Usually when the fans twitch it means that the CPU is OK.  That is not a theory, it is practical experience. My next step is what I suggested to you. Clear the CMOS settings. That is usually a last ditch effort. I always have a spare PSU around to verify that it is not the culprit.
Follow the troubleshooting on this HP web document to check your PSU.  Just testing it with a meter does not help much because it can fail under load. The multimeter does not put a load on the power supply unit. Even those cheapie PSU testers are pretty worthless, except for a cursory test. 
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