I am trying to upgrade a 5200/75 LC.

I installed a working logic board from a 6400/180 and
when the machine starts up, it just sits at the "disk
with a question mark" screen.  When I try booting from
a CD, and then it freezes at the "Happy Mac" screen
after reading only a little bit from the CD drive.

Reinstalling the original 5200 logic board restores
the machine to normal function, and the 6400 runs fine
when I reinstall its logic board.

Am I missing something here?

Thanks,
-Dennis

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