Check out an assistant for muting of completely silencing system startup. Access the parameters of a default chime that plays at launch. Work with the structure and permissions in different versions of your operating system. Replace individual signals according to your needs.
You could have downloaded StartNinja 1.0.1 for Mac from our application library for free. The unique ID for this application's bundle is com.allvu.StartNinja. Startninjainstaller.dmg is the most frequent filename for this application's installer. This free Mac application was originally developed by allvu. The program is categorized as System Tools. The following version: 1.0 was the most frequently downloaded one by the program users.
From the developer:
Macs don't have a built-in way to mute or silence the system start up chime. If you’re in a library or coffee shop you don’t always want that start up chime to play. Now you can silence the Mac OS X(Mountain Lion and Mavericks) start up chime with StartNinja. It is a free and simple desktop utility that silences the start up chime and will resume previous sound level after logging in.
You may want to check out more Mac applications, such as Cinch, Overflow or BOINCManager, which might be similar to StartNinja.