Microphone, What should i do if my microphone does not work, How can i prevent microphone feedback – Sony VAIO VPCF11 User Manual

VPCF119FX, VPCF114FX, VPCF11LFX, VPCF11GGX, VPCF116FX, VPCF11QFX, VPCF11KFX, VPCF111FX, VPCF11JFX, VPCF11CGX, VPCF119HX, VPCF113FX, VPCF11FGX, VPCF1190X, VPCF11EGX, VPCF112FX, VPCF11HGX, VPCF117FX, VPCF11NFX, VPCF11AFX, VPCF119GX, VPCF11BFX, VPCF11DGX, VPCF115FM, VPCF11MFX, VPCF11PFX