Both Mayer and myself were hoping you had a simple problem that the headphone jacks analog to digital switch was just stuck in the digital mode. Which is why Mayer asked you if the headphone jack was glowing red (the mic input jack has a light detector so it won't glow red here).
The test I had asked of you to do looking at the control panel and manually setting to the internal mic should have been able to alter it so you were bypassing both the headphone or mic input jacks. Its' possible the contact within the jack is shorted which would have prevented the switch over. The other thing here would have been the Analog to Digital conversion of the signal (DAC logic) has a problem.
The fact your friends can hear your music does not surprise me. Remember the sound is recorded or feed over the internet in a digital form so it does not go though the DAC logic unlike your analog speakers or headphones as well as your microphone input (internal or externally) which uses a slightly different pathway through the DAC logic. You might have a Bluetooth speaker which is working without any problems as it too works off of the digital stream as well. Because the input logic uses a different pathway than the output logic thought the DAC, its even possible your internal speakers or headphones can still be working too!
Your logic board needs repair or you'll need to replace it. The headphone jack or the DAC logic is damaged.
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