This isn't an unusual problem - no startup chime is reported by users here from time to time, and is usually somewhat inconsistent.
In most instances, the problem either self-corrects, or can be resolved by an SMC reset and PRAM reset. Try these, as follows:
To reset the SMC on an Intel mini:
-From the Apple menu, choose Shut Down (or if the computer is not responding, hold the power button until it turns off).
-Unplug all cables from the computer, including the power cord and any display cables.
-Wait at least 15 seconds.
-Plug the power cord back in, making sure the power button is not being pressed at the time.
-Then reconnect your keyboard and mouse to the computer.
-Press the power button on the back to start up your computer.
Reset PRAM
-Shut down the computer.
-Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in the next step but one.
-Turn on the computer.
-Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
-Hold the keys down until the computer restarts and you hear the startup sound for the second time.
-Release the keys.

Mar 4, 2009 3:27 AM

All the files you will see are saved.aiff - this is the Audio Interchange File Format used by Apple on its computers. There are startup sounds and various VoiceOver chimes in multiple languages. Every Mac with the T2 chip has its startup sound chime turned off. The startup sound is NOT linked to your system volume. It is completely independent and can not be changed in Preferences. Unless there is shortcut that I am unaware of, the only way to mute the startup chime is to dig into Terminal, or use any number of apps that adjust system properties. Here is a tutorial on how to turn it off.

The “StartUp Sound” in Apple Macintosh Computers is the sound or chime which is played each time the computer is turned on. There were many startup tones introduced with time for Macintosh computers such as Happy Mac, Sad Mac, Chimes of death, etc.

The Happy Mac sound used to indicate that the Macintosh computer has successfully run the usual diagnostics and the system is running in normal conditions. Whereas, the Sad Mac or Chimes of death used to indicate a problem in the hardware. All the old versions earlier used to have different chimes. After the release of MacBook Pro 2016, these startup sounds were removed for Macintosh computers, except for MacBook Air 2017.

There can be many reasons that you don’t want the startup sound every time you turn on your computer. Maybe you work late at night and don’t want the sound to disturb your family’s sleep. Or you are attending a meeting and you don’t want everyone to notice you when you turn on your computer. Or any other reason.

If you have the earlier version of Mac and you don’t want the startup sound, everytime you Turn On your Mac, then we have some easy tricks for you that you can use. You can either Mute it temporarily or permanently with these hacks.

How to Temporary Disable Mac Startup sound?

Mac Startup Sound Big Sur

This is a temporary solution for MacBook users and a quick fix too. If you want that when you next turn on your computer you don’t want to hear the MacBook startup sound, you can just turn off the volume or turn it to the lowest level or mute it before shutting down the computer.

In this way the next time you turn on your computer you will not hear the Startup sound. But this is only a temporary fix and you will have to repeat it every time you turn off your computer. Follow the steps below to temporarily mute the startup sound.

First Method

Press the Mute tab or F10 on the upper right corner of your MacBook.
Icon displaying Mute will appear on the screen and it means that the volume is turned to mute.

Second Method

Click on the Apple menu on the upper left corner of the desktop screen.
A drop-down menu will appear. Select the System Preferences from the drop-down menu.

A new window will appear. Click on “Sound” on the new window.

Turn down the Output volume and the alert volume.

Third Method

Mac Startup Sound Over And Over

If turning down the volume every time before Shutting down your MacBook is not the thing for you, or you forget to do so every time then we have another hack for you. This is known as the Auto Mute app. After installing this app you don’t need to worry about turning down your MacBook volume before turning it off. Auto Mute will automatically run and turn the volume down when you turn off your MacBook, resulting in a quiet and no sound when you turn on your MacBook next time. But this is a third party app. You can choose among any of the Auto Mute apps from the app store and try it if you wish. These apps will ensure that the sound is automatically muted every time you turn off or turn off your Macbook.

Mac Startup Sound

If you were not looking for a temporary fix like this one, you can continue to the next step to permanently disable or mute the startup sound. Visual basic 6.0 for mac free download.

Permanent Fix to Turn Off the Startup Sound on your Mac

The Permanent Fix ensures that if the volume of your Mac is turned to the maximum level, still you won’t hear the startup sound when you turn on your Macintosh computer. This fix is useful when you don’t want to remember to turn down your systems volume every time before you turn off your system. In the following steps, we will direct you how to use the Terminal command to permanently mute the startup sound on your Mac.

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Click on the Finder icon in the lower-left corner of the home screen.
On the search box in the Finder window search for “Applications” and click on the “Application” folder. Drag-down to the “Utilities” folder and click on it.

Mac Startup Sound Turn Off

Launch the Terminal Command from the options.
Copy and paste any of the commands from below. If one command doesn’t work use another one from the options because at times different versions of Macbook respond to different commands. So you can try for urself.
sudo nvram SystemAudioVolume=%80
sudo nvram SystemAudioVolume=%01
sudo nvram SystemAudioVolume=%00
sudo nvram SystemAudioVolume=” “

After typing any one of the commands that work for your system, you are prompted to type your system “password” and press “Enter”. This will mute your startup sounds and you will no longer be bothered by the startup noise at any time.

If any point you wish to enable the startup sound, you can follow the same steps and except giving the above command, you can type in the below command to enable the startup sounds.

sudo nvram -d SystemAudioVolume