"not authorized" itunes iphone sync message
I just bought a used iMac. Migrated my MacbookPro stuff over. When I sync my iPhone I get a "this computer is not authorized message" that then pops up an old email address and password. I replace them with the current email & password and I get a "this computer is already authorized. I can't find the source of the old address/code. Any ideas appreciated.
imac intel, Mac OS X (10.6.5)