Hello, I record videos on my Mac with an external microphone which has 2 rings connected to my Mac through a splitter which has 3 rings. My external microphone used to work just fine. I didn't use it for a few weeks and now when I try to plug it in, my iMac doesn't recognize that there is an external microphone in the Sound preferences. I know my microphone works fine because it works on my iPhone and I also know that my headphone port on my iMac is fine because it works properly with a headset which has 3 lines on the headphone jack. I tried restarting and even resetting the NVRAM but no luck. It doesn't show up in Audio MIDI either. Please help. Thanks in advance.