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BrianBaughn

macrumors G4
Original poster
Has anyone here had to resort to reinstalling OS X because of being unable to sign into iCloud in System Preferences?
 
Create a new OS X user, and try logging in to iCloud from that user.

If that works, then your user settings are borked. I'm not at my Mac now, I can see if I can find the settings file when I get home, but it will be somewhere in your user Library folder.
 
This is an issue on a client's new iMac. New user account didn't do the trick nor did monkeying with Keychain or trying umpteen different ideas being thrown around at the Apple forums. Also, the sign-in failed with three different iCloud accounts.

On my first call to Apple they said it was a problem on their end and to try again in 24 hours. 48 hours later another Apple tech said to backup and restore.

My guess is that an automatic system software update went wrong and this is the result.
 
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