how to de-authorize a dead computer
how do I de-authorize a dead computer? music says I am authorized on 5 computers, but at least two of those are from the long gone past.
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See the information about "Deauthorize All" in the "If you need to deauthorize a computer that you don't have access to" sections of Authorize or deauthorize your computer for iTunes Store purchases - Apple Support
You can then reauthorize any computers that you still have and want to use.