Sound input and output not working

Last night my audio was working fine. I was going to record some stuff in garage band and had a microphone plugged into the input line-in on my macbook. everything was working fine still, turned on the "auto leveling" and then put in my headphones. i then turned on the "monitor" to get the sound to actually come to my headphones. I didnt realize until after it was done but you cant have the auto level and monitor on at the same time. There was a short blast of sound in the headphones and then everything cut out. I couldnt get sound from anything, headphones, built in speakers. No sound going in either.
I restarted my computer and if I remember correctly (maybe i'm imagining it) there was the start up chime. when I started up garageband again I got an error message reading "selected driver not found. error 10202" still no sound input or output. When trying to adjust the volume all I got was the grayed out volume thing with the little cross thingy at the bottom. I checked the sound settings and there was nothing in the input or output sound.
I did some searching around and saw people with similar problems (none with an answer).
This is what I've already tried:
I reset the permissions
I reset the PRAM
I did a hardware check (hold d which restarting) i even did the hour long check and there was no problems.
I tried putting headphones in an out (there was no red light in the headphone jack)
I updated all my software (there was an update to OS X to 10.5.8)
After the update there was no longer a startup chime, and i got no error messages when opening garage band. however there was still no input or output sound. when adjusting the volume on the screen it appears to be normal, but there is still no sound from built in speakers or headphones. I did notice there was a very faint "clicking" noise when i try and adjust the volume... like the speakers are getting power or something... but then nothing comes out. In the sound settings there everything appears to be back to normal.
I know this is long, but I wanted to be thorough in describing my problem. I'm posting this on several boards as well.

I'm having the exact same problem. I did install the newest version of Skype the last time my computer was running (with sound)... so not sure if the new Skype had something to do with it.
Also, when I try to change volume with the keyboard keys, there is a little icon (circle with slash) indicating that the sound has been disabled or not allowed to be changed.
I can't find any answers on any forums.

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Sound Input and Output Disappeared

I am considering a purchase of a used Macbook Pro (4,1) from early 2008 with Snow Leopard 10.6.8 installed. When I first tried the machine, the sound input and output were absent. After removing preference files, resetting NVRAM, etc., I finally got them to work. They worked for a few weeks, but recently they disappeared again. This time, my efforts to ressurrect them have been fruitless.
Here is what I have done in an attempt to remedy the situation:
•Delete com.apple.audio.DeviceSettings.plist and com.apple.audio.SystemSettings.plist
•Jiggle a digital headphone jack in the headphone port
•Verifiy Disk and Repair Permissions
•Reset NVRAM
•Reset SMC
I have read online that some people have replaced the AppleHDA.kext file with the one from 10.6.7 - however, every effort I have made to find this file has resulted in failure. I am not able to locate MacOSXupdCombo 10.6.7.pkg anywhere on the web
Any recommendations? I was able to fix this once before - why not now? Thanks for any and all constructive input...

Did you recieve the install disk(s) when you purchase the machine? I would try doing a back up of your data then a fresh install of the OS. Insert the disk into the mac then click restart and hold the c key, ten follow the prompts.
If you wish to take this route, I would try the 10.6.8 combo update first (it should be fine to run it again), then if you wish you may try the 10.6.7 update. Altough I would just do a OS X reinstall and then run software update till you bring it up to date. On disk 2 there should be the AHT (Apple Hardware Test) that you can run by booting the disk holding the D key to check for a hardware fault.
You may also make a Genius bar appointment for a free evaluation, they have more extensive diagnosis tools and would then tell you what your otions would be. (hey it's free)
Genius Bar appointment http://support.apple.com/kb/DL1361
10.6.8 Combo update
http://support.apple.com/kb/DL1399
10.6.7 Combo Update:
http://support.apple.com/kb/DL1361
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After i updated to 10.5.4, my sound input and output disappeared. I've tried to update my quicktime once and i've also reinstalled the 10.5.4 update without any luck. I have a Leopard dvd, but i'm not sure whether i'm able to only install the sound drivers once again? Any other suggenstions?
thanks in advance

Thanks.
I did reinstall the combo, if you mean this one; http://www.apple.com/support/downloads/macosx1054comboupdate.html. And it didn't help, there isn't anything in input or output in the sound preferences panel.
Isn't it possible to perform an install of the sound drivers without having to do a total format? I've looked through my leopard disk content and checked all the optional installs and haven't been able to find them.. Can i download them seperately somewhere?

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I have upgraded my iMac Intel Core 2 Duo (white plastic frame version) to Leopard on Friday when it released. The upgrade process went very well with one MAJOR exception: Audio input through "Line-in" connection does not work anymore. I have tried everything that comes to mind so far from rebooting, to unplugging and replugging, to checking back all system settings, etc. Nothing works. At this point, I can't use my headset anymore for making calls with Skype or using voice chat in games. I would seriously need some help as I refuse to have paid $129 only to have Apple themselves break something in their products.
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The OP reported their line-in input "broke" after upgrading to Leopard, however my MBP stopped recognising input from the mic on my headset a few weeks ago when I was still running Tiger. This might possibly indicate that the change in OS X's handling of the line-in input was present in a Tiger update, but I can't remember the exact correlation between the dates of my last update and this problem. All the same, I'm pretty annoyed that a headset that worked perfectly for several months is now suddenly unusable without a USB adapter.
Prior to stumbling across this thread, I visited two Apple stores, who both tested with an output from an iPod and told me that the input was working fine, leading me to buy a brand-new headset (even though I'd tested other working headsets without success) which, naturally, produced the same results.
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Cheers
Umbi
Edited by: Imbu on Jun 2, 2008 2:40 PM

1. Does it even compile?
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[http://java.sun.com/javase/6/docs/api/]
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ahh sry, thats how the line in works on my Mac Pro, I guess the Macbook is different. This is a program I use in conjunction with another called 'soundflower' to route my audio to all the places it needs to go:
http://www.macupdate.com/app/mac/11333/linein
If you need to run multiple instances, you can open up terminal and type
open -n /Applications/[PUT PROGRAM NAME HERE].app/
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I'm just now having time to browse the forums, so I've not even asked about it.
Yesterday it all started working normally - all sounds.
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~dOiTdiGiTaL~

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Sound input and output not working

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