A fix to speaker not working problems on Macbook/Macbook Pro

I've had problems for about a week where my Unibody Macbook incorrectly detected a digital output device in the headphone jack. I found a solution I didn't see discussed in any of the threads here.
I use the Sennheiser MM 60ip headset. These have an integrated microphone and 4-prong switch; they work with my Mac and 2g iPod Touch. After using them extensively, my Mac thought that I had a digital output device connected whenever I unplugged my headset.
I went through the steps suggested by Apple Support: power cycling with battery removed, resetting PRAM and NVRAM, etc. At a genius bar appointment, the tech plugged in a pair of regular Apple earbuds. After disconnecting them, my Mac worked correctly! I am now back to using the same Sennheiser headset, and the speakers work correctly when I disconnect them from the headphone jack.

Does it now work only on battery? or using the power supply?
If only on the power supply use a grounded plug.
Otherwise try reseating touchpad cable. Post the size and year of your MBP.

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