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?