Option 1 is based on information provided at
Go to the Apple menu, select System Preferences and click on the iCloud button. Now, see if you can sign out of iCloud successfully.Press the Return (aka Enter) key and type your user account password if prompted.Type this command: defaults delete MobileMeAccounts.Issuing commands in Terminal improperly can have very adverse effects on your Mac.) (Before you use Terminal, please make sure you have a full backup of your Mac. Go to /Applications/Utilities and double-click Terminal to open it.(Explaining how to do this is outside the scope of this article.) Make sure you’re signed in to your Mac using a User account that has administrative privileges.Apple introduced the iCloud System Preference pane in OS X Lion, version 10.7.5. If you’re having this problem, try one of these options that have worked for me. Have you ever gone to your Mac’s iCloud System Preferences and clicked the Sign-Out button and then had your Mac fail to properly sign-out of iCloud? Typically, signing out of iCloud is a straight-forward process, but in rare occassions, I’ve encountered difficulty.
