You could be an absolute legend here techknight - I don't even have to go far to source the MOSFETs. I have a donor logic board at work that does power up, but has a bad SMC.
I'll begin probing into that over the weekend. Hopefully will find some positive results.
Presumably something along these lines on a MacBook Pro board (see below) or do they take alternate forms as well? In addition, how would one test them? I've heard they need to be removed from the board prior to testing, but if that's the case maybe i'll just swap them all with ones from the donor board and call it done.
(That's not an MBP board, but you get the idea)