Sony Vaio VGN-N110G will not power up

I've inherited from my son a Sony Vaio VGN-N110G laptop that will not power up. No lights, no sounds, nothing. I've ruled out the power supply cord and battery.

What's interesting is that I took it apart and removed the hard drive, the CD drive, checked all the connections, powered down the BIOS, etc. to no avail. I had given up when I tried the power button one more time and IT POWERED UP. I was elated, and just about to snoop through my sons files when it went dead again. I tried everything that I did earlier but no luck this time

Any ideas?
 
Hope it is not like ours... identical model... went dead and stayed dead. ...now sitting on our display shelf as a worry for Sony customers... went dead and stayed dead... motherboard died, and we couldn't find a replacement at anywhere close to a reasonable price.
Good luck. We will be watching and hoping for a good result we can learn from.
 
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