This trick works for turning on the boot chime sound on any newer model Mac, including MacBook Pro (2016, 2017, 2018, 2019, 2020 and newer), MacBook Air (2018, 2019, and newer), MacBook, iMac (2018 and newer), Mac mini (2018 and newer), and Mac Pro (2019 and newer). Outdoor unit iced-up, fan blades hitting ice (weather-related) Fan blades hitting some other obstruction. Buzzing contactor or noisy solenoid coil. Bad reversing valve - passes refrigerant internally, makes hissing sound. If you enjoy the boot sounds or just have some nostalgia for them, you may like taking a trip down memory lane and listening to a video of all of the startup chimes too. Low refrigerant charge - can cause gurgling sounds. Mac users with this feature enabled, and with Macs that have the boot sound by default (basically anything made prior to 2016), can continue to manually mute the boot sound by holding down the Mute key or by turning the volume all the way down before rebooting the computer, which will temporarily silence it for that particular boot or restart. Recall as mentioned earlier, you can also reset PRAM to silence the boot chime again and return to the current default on modern Macs.
This is a different command from what was possible in prior versions of Mac OS X that allowed for the disabling of the boot chime.
Hit return to execute and enter the admin password to confirm the command can run with administrator privileges as required by sudo. Launch the Terminal and enter the following command: If you enabled the startup boot chime on a new Mac but now decide you do not want to hear it anymore, you can turn it off again. If you fall into that group, you’ll undoubtedly appreciate having this boot sound effect back again on your new model Mac.Īside from the classical aspect and audiophile component of hearing a nice boot sound when starting up or rebooting a Mac, the boot chime has long been used as a troubleshooting indicator for Macs as well, since if the computer did not produce a boot sound effect it was typically an indicator that something was awry. The classic boot sound has been a part of the Mac experience since the original Macintosh and even many other Apple products, it was removed from modern Macs for no obvious reason or stated purpose, much to the dismay of many longtime Mac users and fans who have since wondered where the startup sound went on their new hardware. Note that because this uses the nvram command to enable the sound effect, if you ever reset the PRAM or NVRAM on the Mac the boot sound will become silent again and you’d have to enable it again. Now anytime you reboot or startup the Mac, the boot sound effect will chime. To confirm the startup boot chime is working, restart the Mac as usual or turn it on from an off state.Hit the Return key to execute the command, then provide admin credentials when requested as necessary to use sudo.At the command line prompt, enter the following:.Open the “Terminal” application on the Mac through Spotlight, Launchpad, or the Utilities folder.Here is how you can enable the Mac startup boot sound effect again on modern Macs: With a little effort, you can enable the boot startup sound effect on modern Macs however, including newer model MacBook Pro, MacBook Air, MacBook, iMac, Mac mini, and Mac Pro.