My iMac’s logic board has recently been replaced. Now I notice that in iTunes my iMac wasn’t authorized any more, so I authorized it and it told me that I now have four computers authorized, which isn’t true.
The computers that I have authorized: iMac, MacBook Pro 13″, ASUS Notebook. I think the fourth authorized “computer” is in fact, my iMac’s previous logic board….
How can I de-authorize the iMac’s previous logic board….