Hi all, I have purchased a late 2009 imac. 2.66 Ghz, 8Gb RAM i5. I have seen the machine working. It was then "erased" so I could install the OS and get cracking. However, when I turn it on... It only goes to the OS Recovery mode. If I try and click "Install OS X" it says OS X YOSEMITE is temporarily unavailable. This means it is not associated with my Apple ID. I've tried to go back a version on the OS as directed by the Apple Support Staff. I have a USB boot of OS Snow Leopard. That did not work. It just hangs on the Apple logo and never progresses. The Snow Leopard DVD which I have purchased is constantly ejected by the DVD drive. I've no idea which way to go forward from here. Any advice is appreciated.