Camera Audio problem

[theman96]

So I have a cannon t3i which I love its my first DSLR had for a year now and I was recording video when I noticed I couldn't hear anything when I played back audio. I checked to see if my mic was turned on and It shows this. And the green bar doesn't responded to sound, I plugged up my friends external mic and it worked fine audio came through clear as day. Unplug the external mic and nothing, any idea of whats going on and how to fix? https://www.flickr.com/photos/131054600@N03/15828112613/

[MikeSowsun]

Your camera's microphone may not be working but you can try these things;

1) Make sure the microphone opeing on the camera body is not covered by something. 

2) Try using the microphone in Auto. The recording level may be too low.