Update!

just finished the recap, now the chime is loud and clear.

It seems like the machine is not booting from its hard drive

looking at the floppy port, +5 is 5.00V, +12 is 12.23V but -12V is 0.03V.

EDIT:

I hooked up an external SuperDrive with a copy of the NAD in it, apart from the "blip" that makes after you turn on the system, it does nothing.