I have a Dell Precision M4700 and have never had the need to use the internal mic until recently. However, when I tried to use it, I can not be hear. The mic test does not record my voice and appears to record what sounds like static. I have tried updating the IDT driver, uninstalling it, and reinstalling it. I have also tried using a plug-in mic. I have run the Microsoft Audio Recording Diagnostic Fix which does not detect any issues. Any advice would be greatly appreciated. Thank you!