Rear mic jack and line in jack not working - windows 10 detects when mic is plugged in but no sound recorded. Mic works fine in front jack

[sue12m]

Please help! My mic does not work when plugged into the rear mic jack or line in jack. The speakers plugged into the rear jack work fine - on the same group of ports as both the rear mic jack and line in jack.The same mic works fine when plugged into the front mic jack. Windows detects when the mic is plugged into either rear mic jack or line-in jack. When it is the only mic is is labelled as the default device. BUT the mic can't pick up sound. When I test it it reports max detection 0db. The levels are set to 100% and max mic boost. I have run the troubleshooter and it can't detect any pro

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