Microphone, What should i do if my microphone does not work, How can i prevent microphone feedback – Sony VAIO VPCZ11 User Manual

VPCZ11FHX, VPCZ11SGX, VPCZ116GX, VPCZ114GX, VPCZ11JGX, VPCZ118GX, VPCZ1190X, VPCZ11AGX, VPCZ11EHX, VPCZ11QGX, VPCZ11RGX, VPCZ11GGX, VPCZ11HGX, VPCZ11KGX, VPCZ11NGX, VPCZ11PGX, VPCZ119FX, VPCZ11CGX, VPCZ119HX, VPCZ11LHX, VPCZ11MGX, VPCZ119GX, VPCZ112GX, VPCZ11DGX