I hadn't changed any settings, just woke up and suddenly my microphone wasn't working, it was only picking up my PC's audio. I've tried reinstalling microphone drivers, restarting my computer and changing multiple settings. I've tried using a different microphone, does the exact same thing. I've tried using my microphone on a different device and it worked perfectly. Is there something wrong with my audio card? EDIT - I also just downloaded the latest audio drivers for my system, didn't work.
My operating system is Windows 8.1
My operating system is Windows 8.1