I adjusted the pot until I got 12V and 5V and boom! It booted right up.



It did seem to take forever to boot off the System 7.5.3 floppy that I forgot was in the drive, but at least it works. Even the keyboard and mouse worked once it got to the Finder. I restarted it again and the screen went black. I shut it off and then attempted to try it again with a System 6.0.8 disk to see if that booted faster. I don't know if the painfully slow boot has something to do with the machine or if that's just how slow System 7.5.3 is.

In any case, the second attempt just gave me another checkerboard again. But I guess this proves that the logicboard is good and it is indeed a failing analog board?