Q: Macbook Pro internal microphone not functioning

Hey there, I apologise if this question has been asked numerously. I just can't seem to find the solution to the problem I'm having. I'm currently having a problem with my internal microphone. It doesn't seem to work for some reason. I've already maxed out the volume but there's still isn't any sound coming out. I don't see the blue light that pops when you speak to microphone. I've also tried doing the NVRAM reset and to no avail. I always use my bluetooth headset for the microphone but I'm using the audio jack this time so I had to use the internal microphone but it isn't working for some reason. I was wondering if there's a way to fix this problem I'm currently having. I would appreciate any help. Thanks in advance. Have a nice day.

In case if necessary, my macbook pro model is 13-inches (early 2011).