Macbook headphone output, right channel weaker than left.....

I use my macbook connected to my stereo amplifier using a mini jack to stereo connector. I have started to notice isses though. It seems that after a couple of minets of working fine the volume of the right channel will suddenly reduce for no aparant reason. I have tested my amplifier/speakers/cables and have therefore come to the conclution that the issue is with tha macbook its self. Unpluging the cable from the headphone socket and then pluging it in again seems to resolve the issue for a couple of minets before the right channel once again loses volume...........
Any ideas?
so far i have tried playing around with the sound settings but they are so few and far between that i can see no resolution other than to return the macbook to apple to be fixed.
Thanks alot

If you're absolutely certain your cables, wires, speakers and everything else is 100% then yes, return it. You might try blowing a little into the headphone jack in the event you collected a bit of debris that is causing the problem.

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hello,
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Hi
First to thank you for taking the time to read and consider this if you do - any help in this would be hugely appreciated
Ok - I'll try to make this as concise as poss but it needs some explanation:
I'm home-recording hobbyist musician. One of the things I would very much like to use the iMac for is to back up old four-track tape recordings, recording them as wav or mp3 as the case maybe and saving them to my hdd. Easy right? Apparently not, so far... let me explain:
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Pancenter, thanks once again.
Sorry about delay replying - have had an internet outage here just to add to my woes haha.
Anyway, the good news is that I think I've cracked it:
After updating the OS per your suggestion, uninstalling both Audacity and the m-audio (profire 610), and lastly resetting defaults on sys audio midi prefs I was still experiencing this problem - just on a line-in to Garageband. Pure frustration.
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Thanks for your help and input Pancenter - much obliged.
Peace.

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- If it works with other headphones the try inserting/removing the plug a dozen times or so. Also try cleaning out/blowing out the headphone jack
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Macbook headphone output, right channel weaker than left.....

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