Macbook Audio In Problems

Hi,
On my early '08 Macbook I was using Garageband and thought it would be a good idea to plug the output from my guitar amp into the audio in. Turns out this was not at all a good idea as it now doesn't work at all. I believe it's a hardware issue as using the audio utility it detects nothing when feeding in audio and I've tried hard wiping the computer and starting over. The audio out is fine and works as usual.
Does anyone know how much of an issue this is to fix? Will I just be able to replace the audio or will the entire motherboard need replacing?
Thanks, Ed

I have the same problem, I'm running it on a macbook air with and i7 and 8 gigs of ram and I get cpu load readings of >100%. It's slightly ridiculous, I may downgrade till a fix comes or I figure out the problem. On a side note I have tried the 64bit version and it runs flawlessly I'm just unable to use many vsts so its not practical to use.

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