Keep being asked for your iCloud password?
There is a teeny tiny bug in OS X and iOS that more than a few people have come across and it is related to iCloud. Everything can be running smoothly on your Apple Mac, iPhone or iPad when suddenly you are asked to enter your iCloud password to log in. People with Macs, iPads and iPhones have all suffered from this, but there is a solution.
When it first happened to me, I dismissed the prompt because it had never occurred before, so why should it suddenly appear now? Besides, I’m always very suspicious of pop-ups asking for login details for sites and services. It could be malware, but wait a minute, this is a Mac and Macs don’t get malware right? (Actually they do, but it is a great deal more rare than with Windows.)
I went to the Apple menu, System Preferences, and opened iCloud and everything looked fine. I was logged in to the service OK and so it was a puzzle why I should be asked to sign in again.
Related: No iCloud storage left? Here's where it has all gone. Recover it!
The next time it occurred, I got an iCloud sign in pop-up message on the screen for every single app on the Mac that uses iCloud, such as Mail, Calendar, Reminders, Notes, FaceTime, Calendar and so on. I dismissed them all and despite the messages, I had no problems using the apps or iCloud. Then the single sign in returned.

Some sort of malware was a remote possibility of course, but after thoroughly checking the system with ClamXav, it was found to be clean.
It turns out that there are quite a few other people with a similar problem and it seems that iCloud sometimes gets in a bit of a muddle with your account. It needs clearing out and restarting.
The solution is to go to System Preferences, iCloud and clear all the ticks so that you are no longer syncing anything to iCloud. You should also go into every Apple app (FaceTime, Calendar, Messages, iTunes, Reminders, Notes and any other app you can think of), check the preferences in each app and if you are signed in to iCloud then sign out.
After disabling all the iCloud sync options in System Preferences and every single Apple app, return to iCloud in System Preferences and tick all the boxes again to start syncing once more. You might also need to sign in again with FaceTime and the other apps you signed out of. I don’t think you need to restart the Mac, but try it if you still have problems.
Related: Use Safe Mode on your Mac to solve problems
The iPhone and iPad are similar. In fact, you might need to sign out everywhere on the Mac and the iPhone and iPad at the same time. Go to Settings and select iCloud. Turn off all the options. Go into the settings for every Apple app like Mail, FaceTime, Calendar, Reminders and so on, and make sure you are signed out of iCloud. When you have signed out everywhere you can think of, turn all the sync options back on and sign in everywhere you signed out.

After signing out everywhere, possibly rebooting, and signing back in, you should now find that the iCloud sign-in problem has gone away and the prompts no longer appear on the screen.
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Comments
Thanks
That worked.
Thanks for posting
How do you get it to stop if
If you don't use any iCloud
ICloud Turn off
iCloud prompt won't close
**** THIS
Still not fixed?
Apple like Google wants to CONTROL US!
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Uddin
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Well, my iPhone won't even
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password prompt
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iTouch 5?
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Hi, I still seem to be having
iBrowed
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So turn it off on your
I agree!
iCloud password prompt solution
iCloud password prompt solution
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No data lost
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Never sign in in iCloud
it still doesn't work!
it still doesn't work!
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fix it
simple fix
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Log out, log in
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