Microphone, Why doesn't my microphone work – Sony VAIO VGN-A700 User Manual

VGN-FS645PH, VGN-FS660W, VGN-FS620P, VGN-FS675P, VGN-FS630, VGN-FS645P, VGN-FS625B, VGN-FS690B, VGN-FS630W, VGN-FS680W, VGN-FS690BH, VGN-A790, VGN-FS660, VGN-FS675PH, VGN-FS690, VGN-FS660PW, VGN-FS680, VGN-FS660P, VGN-FS635B, VGN-FS690P, VGN-FS640, VGN-FS620