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Galago UltraPro microphone not working

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linux-howto

http://ubuntuforums.org – I received this computer today and the internal microphone hasn't worked so far. I have tried Google hangouts, Skype, Audacity, and just running Code: arecord test.wav to record audio. All I hear from the microphone is silence with an occasional crackle. When I plug in a USB headset with microphone and select the external microphone in the Sound Input tab I can record sound just fine. I currently suspect this is a hardware problem. Is there anything else I should do to further test this hypothesis? (Hardware)