Why isn't iMovie importing my sound?

When ever i import my sound on iMovie it doesn't work. It been working for about a year but, it just suddenly stopped working. When i import it from my iPhone it works perfectly.also, when i play back the video on the camera the sound works, but when i import it, the sound disappears!
Please I Really NEED Help!

IMovie sometimes can't recgnize the files converted by the third party software, just like FCP 7. You need to change the converter to another one. Just need to google for the iMovie converter and you can get a lot of choices. You can try the demo versions of them. For me, I'm using brorsoft video converter for mac to transcode my tivo recordings, canon.mov files and sony.mts files to AIC for iMove and FCP and never meet such a problem. It is easy-to-use and great in performance and the quality of the converterd files. You can give it a try and see whether it is helpful to you.