about your board sound, you can try to update the drivers in the device manager. right click my computer, double click manage, click device manager, expand the system devices option, look for your motherboard and double click on it, click the drivers tab and click update drivers and fallow the instructions.
about the microphone if the device is plugged in but not being recognize then must likely is a driver problem. try to get the right drivers for the divice that could resolve the problem.
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