MacBook Pro :: Internal Speakers Missing In Sound Preferences

Aug 23, 2014

MBP 1 - 13" Mid 2012 MBP 2.5Ghz/i5/HD4000 (No internal speakers listed). 

1. Reset SMC - No change.

2. Reset NVRAM - No change.

3. Apple Hardware Test - No problems found.

4. The same machine when booted in Windows (via Bootcamp/CSM-BIOS) plays perfectly and shows Cirrus Logic devices and the HDA devices. This should eliminate hardware issues.

5. I have checked for the Optical Audio microswitch being stuck, but that does not seem to be the case.

6. This was used with Apple Headphones which also have the microphone built-in [URL] ....

IORegistryExplorer shows 

Comparing it to another 13" Mid 2012 MBP which has working sound. 

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