mac sound output greyed out, no output devices found
When a Mac shows no output devices, restart the Core Audio service with Terminal, then reset NVRAM if it stays empty. Updating macOS also repairs…

Audio DSP Engineer at Sound Test
Rishabh Sharma is the Audio DSP Engineer on the Sound Tester Audio Team. Expert in browser-based Web Audio API architecture, live tone generation, and low-latency decibel tracking.
Rishabh Sharma is the Audio DSP Engineer on the Sound Tester Audio Team. Expert in browser-based Web Audio API architecture, live tone generation, and low-latency decibel tracking. Shares detailed digital sound processing codebases on GitHub and LinkedIn. On Sound Tester he answers browser, driver and operating system sound problems on Windows, Mac and Android, and reviews how the tools handle audio in the browser.
When a Mac shows no output devices, restart the Core Audio service with Terminal, then reset NVRAM if it stays empty. Updating macOS also repairs…
No sound after a Windows update usually means the audio device was disabled or the driver was swapped. Re-enable it in Sound settings, then roll…
Some equalizers reset because the app is closed in the background. Lock the app in recents and disable battery optimization.
If the buttons do nothing in Firefox, update the browser, allow audio autoplay for the site and turn off ad blockers or tracking shields that block…
Stutter with many tabs means the browser is starved of CPU. Close heavy tabs, turn on hardware acceleration and update Chrome.
Exclusive mode lets one app take control of the device and mutes others. Untick the exclusive options in Advanced.
Start Windows Audio and its dependency services and set them to Automatic. If the error continues, run the troubleshooter.
The Sound Test plays both channels, so if it only plays left the problem is balance, mono audio or the output device. Check the Left Right Test and…
48 kHz is fine for general use, video and games. 44.1 kHz matches CD music. Pick one and keep it consistent.
Aggregate devices need matching sample rates and one clock source. Set the same rate and drift correction.
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