My mac is not detecting external microphone from headphone

my mac is not detecting external microphone from headphone

If your headphone doesn't work on your mac then I suggest you try this:
1. Is it plugged in properly? Don't try pushing it in hard. Thatis likely to break something
2. Call up Systems => Sounds then select the Output tab. Do you see your headphones as an output option? You should see "Headphones" Headphone Output". If you don't see it then you either have a software or a hardware problem. Don't panic yet
3. Leave the headphone plugged in. Close all your apps and shutdown the mac. Press the power button to restart. Hold down the following 4 keys: ALT CMD P R this could also be OPTION COMMAND P R
The mac screen should go blank and should restart again. When you've logged in, call up SYSTEMS => SOUNDS again. Check if you can see the headphone source this time. If you can't, now is the time to panic. You've reset your PRAM and it hasn't made a difference, so you probably have got a hardware problem.

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