The microphone input is usually muted automatically when speakers are active because otherwise you'd get FEEEEEDBAAAAAACK!!!
Try testing it with headphones first to get it set up, right-click the (white) speaker icon in the Notification Area (right-hand end of the taskbar), open Playback Devices in that menu, L-click Speakers to select it (in the Sound window), L-click the Properties button then the Levels tab (in the Speaker Properties window) to get to the device mixer.


There is just two "Microphone - High Definition Audio Device" listed, one is the internal mic and the other for the jack at the front of the laptop.



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