Hello zoefromoranmore,
Thanks for using Apple Support Communities.
In order to deauthorize devices which you no longer have, you will have to use the deauthorize all command, found in the article below.
If need to deauthorize your computer but you can't access it, you need to deauthorize all computers. After you authorize 2 computers, you'll have the option to deauthorize all computers for your Apple ID. You can deauthorize all computers once per year.
To make sure that only you can play your content, or to free up authorizations used by your old computers. Here's when you should deauthorize all computers:
- Your computer doesn't work anymore
- You sold or gave away a computer and didn't deauthorize it first
Just like deauthorizing a single computer, you won't delete anything if you choose to deauthorize all computers. You just won't be able to play content that you bought from iTunes on those computers until you reauthorize them. You need to have the computer to reauthorize it.
Using one of your authorized computers, follow these steps:
- Open your account in iTunes (you may need to sign in with your Apple ID). Or open iTunes, click Store > Sign In, and enter your Apple ID and password.
- Click Deauthorize All.
The Deauthorize All button appears only if you have more than 2 authorized computers. If you don't see the Deauthorize All button, that means you only have one authorized computer.
Reauthorize each computer that you want to use with iTunes. Go to Store > Authorize this computer and enter your Apple ID and password.
Deauthorize your computer using iTunes
http://support.apple.com/kb/HT6283
Take care,
Alex H.