Not booting - black screen, no drive spin-up

Hi folks,

Having a bit of trouble with a white MacBook Core 2 Duo belonging to my son. I'm looking for diagnosis and have read much of whats been posted here but before I get into buying replacement parts I wanted as clear a picture as possible as to what may be the cause.

The device is not booting up - screen is blank and there does not appear to be any life from the hard drive (no sound of the drive spinning up, etc.). I have tried booting from the original system disc - no joy, the machine keeps chiming after attempting (I assume to read the disc). I have taken the upper case containing the keyboard and trackpad out, and looked for signs of spillage and corrosion - none apparent. I have tried disconnecting and reconnecting the hard disc power connector and the display connector - no change.

I am thinking that this is probably a logic board issue, but would welcome any other suggestions coming my way.

Thanks,

John