I/O ports repair on late 2015 27" iMac... Card or whole logic board?
SnuffyApple tech helped me determine that I/O ports are the problem... no type of external device can be mounted on desktop or listed in Finder
Thx SnuffyApple!
Everything from Safe Mode to reinstalling the OS was tried. Drives SD card, Flash memory, ext HD all work on Mac Studio and 17" MacBookPro.
iMac was fine 1/1/23... so 'something' happened. iMac runs fine otherwise.
Was planning to setup repair appointment with Apple... question is ... is there just a card for I/O or does it require logic board replacement?
I have done a HD replacement myself on the iMac. Viewed the logic board replacement on the IFIXIT website.
Update (03/17/23)
Additional information... all those external devices show up or are listed in Systems Report when USB is selected (USB 3.0 bus). Just don't mount.
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