So if a MacBook boots to a solid grey screen...

[M A V I C]

Friend dropped off a MacBook that isn't booting. I get the startup chime, a grey screen, and that's it. I've tried booting off of a disc (10.5 and DW.) Holding down option the DW disc comes up, but when I click the arrow to boot from it, nothing happens.

I reset the SMC, same issue.

Does this mean the logic board is bad?