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Model A1419 / EMC 3070 / Mid 2017 / 3.4, 3.5 or 3.8 GHz Core i5 or 4.2 GHz Core i7 Kaby Lake Processor (ID iMac18,3) / Retina 5K display. Refer to the older iMac Intel 27" Retina 5K Display (Late 2014 & 2015) guides as the system is very similar.

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My iMac 2017 shows the microphone, but sound muffled

My iMac 2017 shows the microphone picks up if I tap on the computer but it does not pick up voices.

I tried plugging in a usb mic as well as apple headphones with a mic and it does not pick up voices then either.

Suggestions for repair. I am running latest operating system. Followed numerous suggestions about adjusting settings and nothing works.

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Did you (or someone else) remove the display at some point? It sounds like the replacement tapes where incorrectly installed review Step 14 in this guide iMac 27" 2017 Adhesive Strips Replacement

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