The external mic is not working

Hellow!

I bought a Rhode Videomic for my Canon EOS 600D,

In the first time it was working very well, but suddenly the mic never worked again.

When I'm filmming, the camera capture only the sound of the gain noise.

I have done a lot of tets with differents option on the audio menu, but I I can't get anything.

I have not guarantee, and I think that is de minijack connection, How Can I remplace this?