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Tech… that really wasn't necessary. The guy is obviously frustrated and feels like he's up against a wall.
Back to CoolCheech…
I'm briefly re-reading your posts. It's pretty difficult to follow it all since it's spread out over 3 threads, but apparently the problem resolved initially after resetting the PRAM, then later when the problem recurred, a reboot would fix it? Since Apple has replaced the motherboard once already and the problem sticks, this seems HIGHLY unlikely to be hardware. The chances that you got 2 defective motherboards back to back with the exact same defect is just quite slim. This continues to suggest to me that you have a software issue. If you have not done a complete and proper CLEAN install as I suggested… not a reinstall over an existing installation or a reinstall with importing of user files/apps, then you really should try it. Bellyaching that you shouldn't "have" to do it won't get the problem resolved, especially if it turns out that the problem really was some 3rd party driver/app and not Apple's fault. Until you try it, you won't KNOW it.
One other thing to try… if you have anything else plugged into your MacBook, and I mean ANYTHING, then unplug it all and see if you still have the issues with the headphones.
Back to CoolCheech…
I'm briefly re-reading your posts. It's pretty difficult to follow it all since it's spread out over 3 threads, but apparently the problem resolved initially after resetting the PRAM, then later when the problem recurred, a reboot would fix it? Since Apple has replaced the motherboard once already and the problem sticks, this seems HIGHLY unlikely to be hardware. The chances that you got 2 defective motherboards back to back with the exact same defect is just quite slim. This continues to suggest to me that you have a software issue. If you have not done a complete and proper CLEAN install as I suggested… not a reinstall over an existing installation or a reinstall with importing of user files/apps, then you really should try it. Bellyaching that you shouldn't "have" to do it won't get the problem resolved, especially if it turns out that the problem really was some 3rd party driver/app and not Apple's fault. Until you try it, you won't KNOW it.
One other thing to try… if you have anything else plugged into your MacBook, and I mean ANYTHING, then unplug it all and see if you still have the issues with the headphones.