So, the disk swap was easy enough... Except now the machine doesn't boot and there's no evidence the kb is being read. It gets power - and passes it all the way through the chain of everything I touched - from the power switch in the top half of the case, through the same cable that connects the keyboard to the mb, through to the disk cable ( the disk spins) to the led on the front, which is connected through the disk cable, too.
But there's no power-on chime, the back light doesn't, and there's no sign of any non-backlit anything on the screen. Holding 'c' or the trackpad button doesn't do anything with the optical drive, either booting from it or ejecting it.
God damn it.
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