.M4A Files not playing in iTunes

Liliac,

Minimize iTunes. In Windows Explorer, find one of the problem files. Right-click and choose Open With > iTunes.

• If the file is a valid M4A, it will start playing.
• If the file is not a valid M4A, it will "error silently," i.e. do nothing. In this case, replace the file.

Do you see any error messages, either a pop-up by iTunes or does an exclamation mark appear next to a song when you try to play it?