If your Apple TV is exhibiting the above symptoms, one of the solutions listed below may resolve your issue.
Note: This article does not apply to non-purchased content (such as content imported from audio CD).
Update your software
Make sure that you have the latest version of iTunes installed on your computer. You can download it here.
It is also important to ensure that your operating system software is up to date. If you have a Mac, you can update your software automatically using Software Update. For Windows, check Microsoft's website for the latest Windows updates.
To check for updates for Apple TV (1st generation): select Settings > Update Software.
Deauthorize and reauthorize your account in iTunes
Refresh your music's authorization by deauthorizing and then reauthorizing your computer. To deauthorize a computer:
- In iTunes, choose Deauthorize Computer from the Store menu (your computer needs to be connected to the Internet).
- Enter your Apple ID and password.
- Click OK.
You can now reauthorize your computer by simply trying to play one of the songs you've purchased. A dialog box will appear asking you to enter your Apple ID and password. Once you have done so, click Authorize to finish the process. If you recently used the deauthorize all option in the iTunes Store, see this document for steps to take.
Note that an active Internet connection is required to playback purchased iTunes Store content on Apple TV.
Restore the Apple TV (1st generation) as described here.
Recreate the iTunes Library
Issues with your iTunes Library could contribute to this issue. Try recreating your iTunes Library by following the steps in this article.
Issues with specific content
Does the issue persist with some of your purchased content, but other purchased content plays without issue? If so, there may be an issue with the content itself. Try restoring it from your most recently-made backup.
If you have other issues with iTunes Store content, please contact iTunes Store Customer Service.