Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

At my school, the administrator seems to have completely muted our Macs. Students are not permitted to raise the volume, and when we try, a the volume symbol pops up with a line through it.

How did they do this?

share|improve this question
    
I liked to find ways to circumvent computer security at my high school when I was younger too. Wanna know what it got me? A week of detention and a year of using a typewriter. –  ubiquibacon Oct 26 '11 at 8:02
    
It's okay; I'm actually in a good situation with our tech admin. I find flaws for him to patch - but this one I'm not sure about. Once I know how they do it in System Prefs, I'll try it from the command line... Ideas how? –  tekknolagi Oct 26 '11 at 8:29
    
Try executing AppleScript using osascript. There you can use set output volume (documented in Standard Additions, I believe). –  Daniel Beck Oct 26 '11 at 8:55
    
There can be a load of ways to do it... –  m0skit0 Oct 26 '11 at 8:56
    
@m0skit0 Explain, please. –  slhck Oct 26 '11 at 10:06
show 1 more comment

1 Answer

up vote 2 down vote accepted

I can think of three ways off the top of my head:

  1. If the Mac has an audio output method available besides the built-in speakers, the admin can change to an output method that doesn't actually output sound.

  2. The admin could remove all audio-related KEXTs (in other words, the OS sound drivers)

  3. I don't have personal experience with this, so this one might be wrong, but: An admin can use Apple's Server Admin Tools to restrict access to different preference panes, and i think maybe if they restrict the Sound preference pane it might prohibit volume changes. But i'm not positive, i'm not a system admin (and Apple's link to Lion's Server Admin Tools is not working at the moment, so i couldn't test)

share|improve this answer
    
wow. that's awesome! thank you! –  tekknolagi Oct 27 '11 at 5:47
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.