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Message: <blockquote data-quote="jsg68" data-source="post: 1861893" data-attributes="member: 405615">Yeah, it would seem an unlikely cause to me, also, but it is step 18 in the Apple troubleshooter, and since it's a potentially easy fix, worth trying.  (I also found one video where a professional repairer found it to be the source of the problem for a 2014 imac 21.5, albeit with slightly different symptoms (intermittent power off/inability to boot, with LED 1 and 2 lit).Anyway, troubleshooter says to look for 2.7V or less.  I measured 2.86V.  Though labeled 3.0V, nominal on the BR2032 is allegedly 2.8V.  So it does not seem that this is the problem.  (I can't help but say, even if these are supposed to be 10+ year batteries, it seems insane to bury a part that will *eventually* need replacement so deep that literally the entire system needs to be disassembled to do so!  I mean, why not place it on the other side of the board, where it would be easily accessible.  Same for the flash drive, at that!)I continued on to try resetting the real time clock via the reset pads, per the troubleshooter.  None of it has made any difference.Ftr, there's no visible indication of any kind of damage on the motherboard.I've sent email to the PS supplier (iFixit) asking how long ago the unit would have been tested to confirm proper operation, and whether that testing would have included testing the damaged connector.  (That ribbon cable is listed in the service manual as carrying the power on signal and PS temp sensor, and it indicates it can cause a no power symptom.)Unless the replacement PS I got is dead also, I dunno what to think at this point.Does anybody know where I can find pinout indicators for the DC power connector, in order to test it to confirm at least proper voltages are present?</blockquote>

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