http://ccm.net/faq/8333-windows-7-renaming-a-disk-label

It sounds like the home button flex was damaged. You'll probably have to replace it to fix the problem: Reemplazo de Cable Plano del Botón de Inicio iPhone 5

The secondary or upper mic on the iPhone 4S is located at the top of the phone next to the headphone jack. There is a small pinhole you can see from the exterior of the phone. On the interior, this mic is located on the headphone jack flex cable. You can test it by using the speakerphone function. iPhone 4S Headphone Jack Cable Replacement

That problem can happen when the bottom microphone gasket isn't inserted into it's hole on the bottom of the phone.

I've had this problem on the occasional 4/4S LCD, and suspect that some LCD flex just can't handle bending prior to installation. You may want to test with an extension cable, or just wait until the LCD is installed. It's also good to avoid connecting/disconnecting the LCD while the backlight is on.