[zzyzzyxx]

I bought my mp4 yesterday - I've put some mp3 files, amv videos, and photos. Everything was fine but suddenly, it stopped seeing the photos and video files (but it did before). It says:"No files" (but it seees all the mp3 files, and plays them without problem). When I connected it to computer, the window was empty - no folders (earlier I had mp3, amv, voice, music, photo etc folders - now they're gone). It's just like there is nothing in it. But the mp3 files are still there, and the amount of taken space is as it was with everything. What happened?