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@mac84tv Hey! I don't have a vintage PSU, so I'm using a modern ATX supply with an adapter cable (based on xlr8yourmac's well-documented solution). Voltages on the PSU all look good.

I can boot the Mac by shorting the appropriate pins on the panel header (3 power-on to 7 ground). I just need a button, but the board doesn't want be that! Measuring the continuity of the corresponding pins on the panel board, the power button has resistance when pressed – enough not to work.

Perplexing!