MacBook Pro 13" Late 2011 - Internal Microphone Not Working

Hey everyone, I've been having trouble with my internal microphone on my 13" late 2011 MacBook Pro every so often. In the Sound preferences, Internal Microphone (Built-in) has been selected on the Input tab, the input volume is on full and the audio port has been set to Sound Output so the internal mic is the only input source. However, there is no signal detected by the input level bar. There's also no input on Skype, which is the main thing I use the internal mic for. I do have an external microphone by means of a headset, although I have to set up a small mixer to have a headphone and microphone input and this takes some time, which I do use but sometimes, for convenience, I'd rather just be able to use the internal mic and use some headphones in the built-in output.
I can't figure out why it doesn't seem to activate, usually a restart activates the mic but I haven't had much success doing this today, and really, the mic shouldn't be doing it in the first place.
If anyone can shed some light onto this, please do!
Thanks in advance,
LiamWatson28.

You may try a PRAM reset. If that does not resolve the issue, make an appointment at the Apple store Genius bar.
Ciao.

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