How can I completely disable the sound on an iMac?

I work at a high school where I am in charge of all technology on campus, as well as the position of librarian (an effort to save money by the disctrict). In the library, I have about 14 iMacs (2008) that are available for students to do research and reports on, though the computers have basically been turned into really expensive Facebook and YouTube machines. Anyways, I'm looking for a way to completely disable the audio on these iMacs. Simply muting the volume and hiding the control on the toolbar doesn't help because there's volume control right there on the keyboard. Is there any way to just disable the sound all together? Such as disabling the sound card or possibly usuing a utility or script? An even better solution would be to disable the speakers, but leaving the headphone jack enabled so if need be, a student can plug in headphones and still get sound. But I'll settle for completely disabling the audio, if anyone can help with that. Thanks so much!

One thing you might try is going to System Preferences/Sound and changing the output from Internal Speakers to Line Out or Digital Out. Line Out would be for headphones. I assume it keeps this setting after a reboot but you should test it.
Disabling the sound will also disable all warning sounds. Those can be pretty useful.

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Dan,
It sounds like one of your preferences has changed.
Go to preferences > audio > general, and make sure "track mute/solo" is set to "CPU saving (slow response)". It is probably set to "Fast " at the moment.
This setting (fast) basically causes immediate muting from the channel strip while your song is in play. This is because the audio is still being read from the hard drive, but the channel strip is simply muted.... like a hardware mixer. When set to "CPU saving", the audio from that track, when muted, is actually stopped from streaming from the hard drive, but there is a couple second delay before the audio is actually muted.
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How can I permanently disable the "fn" key?

Hi. My subject says it all. How can I permanently disable the "fn" key?
At first I thought I had a virus or something because when I typed only weird symbols came out. Then I reset the computer. Then I couldn't even log in. I tried Time Machine etc.
Then I realized that the "fn" key wasn't working right. It seems to be working backwards. It acts like it's being pushed when it's not, and when I do push it it acts like it's not being used.
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That's the best answer. Yeah usually if you press "fn" or "option" you can get it to work for awhile.
Yeah I have considered some kind of external keyboard also. It will make a laptop less laptopish. But it could do the job for awhile.
It's sad because I don't even care about the "fn" or "option" keys.
But anyway it's not catastrophic at least.
And yeah maybe we can get a new computer later or something. I like mine though. It's customized and is how I like it right now.
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How can I completely wipe the hard drive with out the Mac OS X disc? I don't need any of the info on the computer.

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To contact product and tech support: Apple - Support - Contact Apple Support.
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How can I completely disable Airport / BlueTooth?

Hello All,
I've asked this in another thread, but have just realized that there is a dedicated Airport discussion area. So, I figured I would refine my question using information gathered from my previous discussion, and see if you fine people here in this discussion group might be able to shed additional light on my question.
So, here we go:
For those that want the background on my question, the original thread is at:
http://discussions.info.apple.com/webx?128@@.68bc9dac
My desire is to completely disable the Airport and BlueTooth features that are now integrated into the new systems.
I am considering purchasing a new iMac G5 or Power Mac G5, and want to see if it is possible to disable these features before I spend my money.
While others are convinced that I am crazy, my personal desire is not to have this type of radio frequency / radiation emissions on my desk.
I know there are many who feel it is not an issue or problem, so rather than discuss whether it is a warranted concern, I would prefer to discuss the simple matter of whether it can be disabled.
(see my previous discussion for my feelings / research on the subject)
My previous discussion led me to understand that it is soldered into the main board on the 2 latest revisions of the iMac G5, and probably also on the Power Mac G5. Any confirmations / corrections there?
I was hoping that I could simply unplug them like I could on older systems to eliminate them completely.
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If you know where I might find technical documents supporting or explaining how this enable / disable feature works (in relation to the above question), I would greatly appreciate it.
Additionally, in the event that disabling the features in Software / OS X doesn't work, is it safe (or possible) to simply disconnect the antenna from the Airport / BlueTooth controller or circuitry. It would seem that this might be quite easy on the Power Mac G5. It might still be possible on the iMac G5's with built-in Airport and Blue Tooth.
Yes, I know that some will think this quite unusual. Some may think I'm weird or strange. But, if you read my other discussion, you might understand my personal perspective and concern.
Either way, I am hopeful that rather than discussing whether there is a valid concern, that we might be able to discuss options and ideas on how to disable these features.
Thank you in advance.

Your original thread on this topic has pretty well beaten the subject to death.
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Are my applications compatible?
         See App Compatibility Table — RoaringApps.
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Hello,
I use the CAN
Transmit-periodic.vi in LV 8.5, I want to enable or disable the
transmission of a frame without stop the loop of my VI, does it exist
in the frame api a vi which could stop, or mask the transmission of a
frame?
It's important I don't want to stop my VI that
send my frame just filter a frame that I don't want send on my CAN
bus...(I would command it with a boolean for example).
Thank you.
Bye.

Hi there
I'm not familiar with NI-CAN, but take a look at
\vi.lib\Nican\nican.llb\ncAction.vi
Can be found in the CAN\Frame API\Advanced palette.
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Stop Stops the CAN Object. For example, if the CAN Object is configured to transmit data frames periodically, this action stops the periodic transmissions. This action will also clear all entries from the read queue.
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chris
CL(A)Dly bending G-Force with LabVIEW
famous last words: "oh my god, it is full of stars!"

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