Imac won't reinstall osx. It says my apple id hasn't purchased lion
Hi, i recently decided to give my dad my imac (2011). So before i handed it over i cleared everything from the mac so it would be back to factory settings. All hat went fine. I then went to reinstall my operating system. Everything goes well until it asks me to enter an apple id. I enter mine and a message come up saying "this apple id has not purchased lion" as far as i am aware lion came with the mac when i bought it.
Thanks.
iMac, Mac OS X (10.7.5)