I need to disable my iMac's internal mic

Does anyone know how to disable the internal microphone. I went to preferences, sound, input... and lowered the mic but it still picks up sound.
Thanks.

I have a similar issue (well exact same issue) however I will provide some background:
I lost my guitar tuner so I downloaded a rather neat program (Guitar Tuner 5.1) to tune my guitar on my iMac. I have my guitar plugged directly into the line-in jack on the back, however I cant be sure if the program is picking up the guituar off the line-in or the built-in mic since there is no way to disable one or the other. Any suggestions or anyone familiar enough to tell me I am doing a-okay?
Cheers Everyone!

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Im having a problem with the volume of the internal microphone on my 24" imac (2.8 ghx, osx 10.6.4). When I am trying to use msn video chat (yeah i know i shouldn't use msn at all but my girlfriend insists on it) the volume keeps dropping while I am trying to use it, sometimes to the point where the other person cant hear me. I can watch this happening in the settings but all i can do is turn it back up. Ive checked on google and other people seem to ave had this problem but i couldnt find a solution.
Any help with this would be hugely appreciated,
Thanks
Adam
Message was edited by: ralph1471
Message was edited by: ralph1471

some say a resetting of the PRAM at restart worked.
but it did not for me:
Same problem here:
neither in Skype nor in Quicktime audio recording does the microphone pick up a reasonable level.
The mike does not seem broken though, as if I put the input level at maximum in the system preferences pane: sound (and check "use ambient noise reaction") there is some reaction if I tap on the frame of the iMac or literally yell into the iMac. (the Quicktime recording then registers the voice, but only faintly).
I have done a Pram reset/restart, to no avail so far and am hoping for some bright solution in this forum.
One reason for the error might be that when a local Apple store recently replaced the Airport antenna-module on my iMac (it had failed completely after around 3 years) they might have done something to the mike wiring...

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Hi Guys,
I have a question - do I need to defragment my iMac? I have noticed it is getting slower.
blueheron11

Well, I'm going to put a contrary view to others you have received here, blueheron.
Most users, as long as they leave plenty of free space available , and don't work regularly in situations where very large files are written and rewritten, are unlikely to notice the effects of fragmentation on either their files or on the drives free space much.
As the drive fills the situations becomes progressively more significant, however.
Some people will tell you that "OSX defrags your files anyway". This is only partly true. It defrags files that are less than 20 MB in size. It doesn't defrag larger files and it doesn't defrag the free space on the drive. In fact the method it uses to defrag the smaller files actually increases the extent of free space fragmentation. Eventually, in fact, once the largest free space fragments are down to less than 20 MB (not uncommon on a drive that has , say only 10% free space left) it begins to give up trying to defrag altogether. Despite this, the system copes very well without defragging as long as you have plenty of room.
Again, this doesn't matter much when the drive is half empty or better, but it does when it gets fullish, and it does especially when it gets fullish if you are regularly dealing with large files , like video or serious audio stuff.
If you look through this discussion board you will see quite a few complaints from people who find that their drive gets "slow". Often you will see that say that "still have 10 or 20 gigs free" or the like. On modern large drives by this stage they are usually in fact down to the point where the internal defragmentation routines can no longer operate , where their drives are working like navvies to keep up with finding space for any larger files, together with room for "scratch files", virtual memory, directories etc etc etc. Such users are operating in a zone where they put a lot more stress on their drives as a result, often start complaining of increased "heat", etc etc. Most obviously, though, the computer slows down to a speed not much better than that of molasses. Eventually the directories and other related files may collapse altogether and they find themselves with a next to unrecoverable disk problems.
By this time, of course, defragging itself has already become just about impossible. The amount of work required to shift the data into contiguous blocks is immense, puts additional stress on the drive, takes forever, etc etc. The extent of fragmentation of free space at this stage can be simply staggering, and any large files you subsequently write are likely to be divided into many , many tens of thousands of fragments scattered across the drive. Not only this, but things like the "extents files", which record where all the bits are located, will begin to grow astronomically as a result, putting even more pressure on your already stressed drive, and increasing the risk of major failures.
Ultimately this adds up to a situation where you can identify maybe three "phases" of mac life when it comes to the need for defragmentation.
In the "first phase" (with your drive less than half full), it doesn't matter much at all - probably not enough to even make it worth doing.
In the "second phase" (between , say 50% free space and 20% free space remaining) it becomes progressively more useful, but , depending on the use you put your computer to you won't see much difference at the higher levels of free space unless you are serious video buff who needs to keep their drives operating as efficiently and fast as possible - chances are they will be using fast external drives over FW800 or eSata to compliment their internal HD anyway.
At the lower end though (when boot drives get down around the 20% mark on , say, a 250 or 500 Gig drive) I certainly begin to see an impact on performance and stability when working with large image files, mapping software, and the like, especially those which rely on the use of their own "scratch" files, and especially in situations where I am using multiple applications simultaneously, if I haven't defragmented the drive for a while. For me, defragmenting (I use iDefrag too - it is the only third party app I trust for this after seeing people with problems using TechToolPro and Drive Genius for such things) gives a substantial performance boost in this sort of situation and improves operational stability. I usually try to get in first these days and defrag more regularly (about once a month) when the drive is down to 30% free space or lower.
Between 20% and 10% free space is a bit of a "doubtful region". Most people will still be able to defrag successfully in this sort of area, though the time taken and the risks associated increase as the free space declines. My own advice to people in this sort of area is that they start choosing their new , bigger HD, because they obviously are going to need one very soon, and try to "clear the decks" so that they maintain that 20% free buffer until they do. Defragging regularly (perhaps even once a fortnight) will actually benefit them substantially during this "phase", but maybe doing so will lull them into a false sense of security and keep them from seriously recognising that they need to be moving to a bigger HD!
Once they are down to that last ten per cent of free space, though, they are treading on glass. Free space fragmentation at least will already be a serious issue on their computers but if they try to defrag with a utility without first making substantially more space available then they may find it runs into problems or is so slow that they give up half way through and do the damage themselves, especially if they are using one of the less "forgiving" utilities!
In this case I think the best way to proceed is to clone the internal drive to a larger external with SuperDuper, replace the internal drive with a larger one and then clone back to it. No-one down to the last ten percent of their drive really has enough room to move. Defragging it will certainly speed it up, and may even save them from major problems briefly, but we all know that before too long they are going to be in the same situation again. Better to deal with the matter properly and replace the drive with something more akin to their real needs once this point is reached. Heck, big HDs are as cheap as chips these days! It is mad to struggle on with sluggish performance, instability, and the possible risk of losing the lot, in such a situation.
Cheers
Rod

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Poking around in Prefs, I saw that my supposedly "disabled" microphone showed a response in the Dictation & Speech pane VU meter when I would snap my fingers around the bezel. Even worse, it showed a response to conversation in another room, the refrigerator starting up in the kitchen 25 feet away, and even an increase in ambient noise. Going back to the Sound prefs, the mic input is still turned "down" and doesn't show a response when I snap my fingers.
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Interested parties may want to know...
I went to the Apple Store two weeks ago for a replacement Airport Express. While I was waiting for it, I struck up a conversation with one of the store staff, and brought up the mic issue. We spent a good ten minutes going through the few ways of securing the mic, and we determined that every iMac made has the ability to continue listening evne though dictation is shut off. Unlike old Macs, you can't disable the mic in the Sound prefs. You can't turn off listening in the Dictation prefs - even though turning off "dictation" means the dictation part of the OS stops listening. The only way to definintely shut off the "listening" part is to keep the Audio Devices panel open, select Built-in Microphone, and make sure the master mute button is checked. Also, you have to leave the Dictation & Speech pane open in Preferences to watch the mic display.
Even so, going to any other preference panel and then back to Dictation & Speech means that the master mute will uncheck itelf and the mic goes back to listening mode.
The staff member was quite frustrated by this and said it appears the only way to stop the iMac from listening with any certainty would be to block the mic, just like millions of users block the Facetime camera with a piece of tape.
I suppose I should admit defeat at this point, and maybe I should have long ago recognized that no matter what the system tells us, we shouldn't trust it. Simply clicking on a radio button to disable what in all actuality is really a room bug shouldn't have us letting out a sigh of relief and saying "Wow I'm glad I was able to stop that security issue by trusting the machine to let me know when it was listening."
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