I bought a new late 2012 iMac on Monday. After setting it up from a Time Maching back-up and updating software and also EFI, the iMac didn't boot correctly. As I interpret it, the iMac applied the EFI-update and restarted, but while rebooting just the moment before the desktop pops in it remained stuck. The spinning wheel under the Apple logo kept on spinning but nothing else happened.
I turned it off and did an SMC-reset, which did the trick, sort of. Today I turned the iMac on, and again it didn't boot correctly. Again, only a SMC-reset resolved the issue temporarily as it seems.
Does anyone know how to procede? I'm not ultra satisfied with such an unforeseeable behavior as you can certainly imagine.
Thanks in advance,
After talking two times to Apple Care for about one hour each, I've come to no conclusion what the problem is about or how to fix it.
I tried to erase my HD und reinstall Mountain Lion again, which I did also two times. The strange thing was that I faced the same issue every time after transferring my TM-back-up to my iMac. So I came up with the idea that my back-up was broken somehow and included that error.
Anyway, I erased my HD once more, installed Mountain Lion as clean as possible, and installed all of my software manually. I haven't seen the issue since. It just took me like 20-30 hours to try out everything and two useless calls to Apple Care. It's like the Windows-times are back…
Maybe this helps anyone.