Please go to the Apple logo at the upper left of your computer screen to About This Mac and give me this information:
Sign Out of iCloud then:
Reboot into the Recovery HD by choosing the ‘Apple‘ menu > Restart, then hold down the ‘Command’ + R’ keys on the keyboard during the start up process. When you see the Apple Logo you can let go. When the machine boots you may have to choose your language then you will see the OS X Utilities screen. Select the Disk Utility and then select Continue. Then in Disk Utility select Macintosh HD in the left column (if there are two with that name or it is named something else choose the first indented item) and then Highlight your hard drive and on the right select the First Aid tab if it is not already selected, then click on Verify Disk on the far right. If that says “OK” in green type then select Repair Disk Permissions. If it is not ok let me know.
If all is ok go to iCloud.com and make sure you can sign in then try to sign in again on the computer
OK let me know
Ok a big update came out last night El Capitan I'll bet the severs are overloaded
OK sorry I'm out of ideas
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