Internal Speakers Completely Silent After Sleep – MacBook Pro M1 (macOS 26.4)

Since the Apple Diagnostics did not play any audio, there are only a few things you can try.

You can try clearing the NVRAM just in case it contains some audio related setting that has become corrupt or was set incorrectly. Launch the Terminal app and issue the following command:

sudo  nvram  -c

This command will prompt for your macOS admin password. Nothing will appear on the screen as you type the password, so press the "Return" key to submit the password. You may see a message that some items could not be cleared such as the Computer Name. This is Ok and can be ignored. As long as the command itself did not report an error, then it was successfully executed. Restart the computer so the system can pull in the default NVRAM settings.

If you don't hear the startup chime or an audio, then you will need to try a DFU Firmware Revive which resets the security enclave chip & system firmware. While this should not cause any data loss, you should definitely make sure you have a good current backup first just to be safe. Unfortunately this process does require access to another Mac currently running macOS 26.x Tahoe (perhaps macOS 15.7.3+ Sequoia will also work, but you may need to use the Apple Configurator app). Make sure to follow the Apple instructions exactly since timing is everything as is the cables & ports used. Unfortunately Apple mentions being able to use macOS 14.x Sonoma, but I don't believe that information is correct anymore....I'm not entirely certain Sequoia will work now.

If a DFU Firmware Revive doesn't solve the problem, then the nuclear DFU Firmware Restore would be the last item to try which does what the Revive does, but also resets the internal SSD (destroying all data on it) and pushing a clean copy of macOS onto the internal SSD. Make sure to test the clean install before installing any apps, before restoring from a backup, and before signing into your AppleID/iCloud.

I would also suggest disconnecting all external devices as well just in case one of them is causing a problem.

konakos wrote:

Device•

MacBook Pro 16-inch, M1 Pro, 2021 macOS 26.4

I put my MacBook to sleep with the speakers working perfectly normally. On waking, the internal speakers produced no audio whatsoever. At the same time, Bluetooth audio and Bluetooth microphone had also stopped working. The only audio output that remained functional was the 3.5mm headphone jack.

Current State

Internal speakers:• completely silent but visible as a device in both Sound Settings and Audio MIDI Setup

What I Need

Has anyone experienced the same issue on a 16-inch M1 MacBook Pro, specifically the sleep/wake-triggered speaker loss that survives a full erase? Did a software update resolve it for you, or did it turn out to be hardware?

I am also curious whether anyone knows if this specific failure pattern has been acknowledged by Apple or whether there is a known fix beyond what I have already tried.

Any help appreciated.

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and compare your results.

no insight or resolve—

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