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Your combined headphone/mic plug probably has four 'bands' including the tip.

Does your MacBook have one or two audio mini-jack inputs?

If it has one jack, you should be OK, but your headset mic could be defective. Have you tried a different combined mic/headset?

Older MacBooks have two separate jacks for audio input and headphones. 'Line in' audio expects an amplified audio source as input, such as a microphone attached to an external amplifier, or an iPod output through a stereo cable with a mini-plug on each end. Your headphone mic is probably not amplified.

Headset Mic Not Working Windows 8

This screen capture shows a (blue dot) peak audio indicator with a (mono) amplified mic as input.

If you have an unamplified mic, you likely won't get ANY sound indication from Line In, even tapping directly on the mic.

Runmus Stereo Gaming Headset

This Apple guide may help you determine your exact model and the audio capabilities:

Runmus Gaming Headset

Mar 23, 2012 2:28 PM