No file
iv had the same problem, all my files are on the Samsung YP-U1 when connected to the pc but when disconnected says no file.
I tried everything but with mine I deleted all the DRM files (Digital Rights Management) and re-copied the non DRM files back to the device and they seem to work now. I dont know if that'l help but its worked on mine.
If not buy a better mp3 player which'l allow DRM files
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