Updated symptoms summary: - I can hear the Macintosh consistently power cycling at about 2 cycles per second. I hear the CRT charge and the floppy drive make a little noise. - There is no bong or display. - The cables have good connections, as tested with a multimeter. - All of the components in the spreadsheet linked in the original post have been replaced except for the J4-J7 cable (however, it and the board connectors have been inspected and tested with a multimeter). - The voltages are cycling (along with the rest of the machine). - Adjusting the voltage cutoff does not change the symptoms at all. - Holding the reset button on the logic board does not change the symptoms at all.
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