If you’re trying to play an AAC file that was not created using iTunes or downloaded from the iTunes Store: Songs you download from the iTunes Store or import into your library using the AAC encoder are encoded using the MPEG-4 AAC format. See Share iTunes libraries on local network. If your computer isn’t authorized to play songs purchased by the person who is sharing the song, to hear it you’ll need to enter that person’s Apple ID and password. To listen to a purchased song in a shared library or playlist, double-click the song. If you’re listening to a shared library or playlist: iTunes skips iTunes Store purchases if your computer hasn’t been authorized to play them. See Usage rights for iTunes Store purchases. If the song is available as an iTunes Plus download, you can upgrade the song at the iTunes Store. (For instructions on deauthorizing a computer, see Authorize a PC to play iTunes purchases.) After you authorize five computers, you can’t play the songs on a sixth computer until you deauthorize one of the five authorized computers. If the song isn’t an iTunes Plus version, you can play it on up to five authorized computers. See the Apple Support article If iTunes for Windows prompts you to authorize your computer when you try to play purchases. If you can’t play a song purchased from the iTunes Store: You may have exceeded the number of computers on which you can play your purchases. If you’re using an AirPort Express, you can find more troubleshooting information in the documentation that came with your AirPort Express, or at the AirPort Support website. If you’re trying to listen to music through remote speakers using AirPort Express: Make sure the remote speakers are selected in the AirPlay pop-up menu at the top of the iTunes window, and the volume control on the speakers isn’t turned down. Also make sure their volume isn’t turned down. If you’re using powered speakers connected to your computer: Make sure the powered speakers are properly plugged into your computer’s audio port, plugged into a power source, and turned on. Also, try playing a different audio file, CD, or DVD, or try playing the file or disc on another computer or media player to isolate the problem. Check the control at the top of the iTunes window and check the computer’s output volume (in the Sound and Audio Devices Properties control panel).
If you’re using your computer’s built-in speakers: Make sure the volume controls are not turned down.
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