Laptop Power on Issue

Dear All,  I have a critical problem with HP Probook 640 G-1 it has power on issue. When I Press Power button neither power on nor display.I Swap Processor and RAM with a good one,I have replace motherboard with new one but issue is still no resolved.I disconnect all components Optical drive, Wi-Fi card, RAM, Battery, Keyboard Wi-Fi, volume buttons. Even processor.One more thing when I connect Power adapter (Charger) Power LED blink for a second and then turned off but this blink only happen when battery not connected  when battery connected even blink is not happen.  Waiting for good response please do need full. Thanks and regards Muhammad Sohail    

Did you try downgrading to 3.11 to see if that helps ? Looks like other people may be having similar issues - see the later posts in this thread here .
That was originally about a issue with suspends on 3.11 i386 only that was fixed in 3.12. But the last few posts seem to indicate a different issue that started with 3.12.

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