Those figures look okay, but it's through the logic board where it's losing voltage and that's probably being caused by failing capacitors.
I don't think that it needs recapping, as there are no signs of cap crap on the mother board.
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1/ Plug the HD into a good known PSU (not the Mac PSU) and see if that spins the HD up sufficiently to boot. Obviously you'll need to have the HD data cable connected to the Mac logic board.
Umm... I don't know the correct voltages for each pin on the connecter. Help appreciated. Also, the HD spins up initially, the problem is it won't stay spun up long enough for the mac to boot from it (see boot timelines posted above in previous posts).
2/ Heat up the board with a hairdryer and see if you can get the capacitors sufficiently warm to enable at least one successful boot.
How does warmming the capacitors help???
