Audio line-in input won't work

Hello,
have used Garageband several times in the past, and have had no problems setting the input as audio line-in to record my guitar. However, I tried again for the first time in a couple of years the other day and neither my Powerbook or my iMac would allow me to do it. In System Preferences, the audio line-in input option was not in the drop-down menu. I could only choose iSight or built-in microphone.
I don't think it is the mini-jack adapter that I am using that is the problem. It hasn't been damaged as far as I can see and fits in the socket fine. I tried it in the headphones socket and it clicks in place there and registers in the system preferences. Has there been some kind of bug in a recent(ish) update that has killed audio line-in inputs?
Am running Leopard on PowerPc processors. Realise that the tide has turned against these two computers and that they will need replacing in the next year or two.
Any help massively appreciated ...

Did you see the fix for this problem and did you try it? I use to do a lot of direct line in recording with my guitar and now I have the same problem. I won't be able to try to fix till tonight. I am in Oregon. So I was just curious if you got a solution.
Cause I am kind of ****** about this.
I would appreciate you feedback!
Thanks
Mat

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My specs:
http://support.apple.com/kb/sp644

Couple of things to check, you say you have selected line in ok, are you sending an analog signal to the line in port?(It needs to be analog to be seen) If you are, when you open QT, under file click new audio recording, then also click the little white triangle on the upper right and make sure that it is set to line is a well. You need to click the red square to begin recording. Also check the Audio MIDI Set Up is configured as in the 2nd screen shot

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http://www.macupdate.com/app/mac/11333/linein
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open -n /Applications/[PUT PROGRAM NAME HERE].app/
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yip it sounds like you have fried a circuit..
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Message Edited by Jamesnb on 06-26-2009 12:19 PM

now what you can try is can try to test the MotherBoard once and if there is any issue with the onboard card then you have to replace the card.
if there is no issues with the MotherBoard then try entering device manager in safemode and uninstall the drivers once and check if its working.

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Now, my line out audio stopped working. Now before you think I'm crazy and I submitted a question for what is obviously bad hardware, listen to this.
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Here's my advice...
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3. Tried the 1/8" audio input, problem persists.
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I used a UVC-compliant USB Logitech camera (the
Fusion) driverless
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Audio line-in input won't work

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