ITunes 12.1.2.27 X Backup iPhone 4S IOS 8.3

Question

Hello!
Since day 04/10/2015 I'm not getting back up my iPhone 4S iOS 8.3 via iTunes vs. 12.1.2.27. ITunes returns the following message:
"ITunes could not back up the iPhone" iPhone name "because the iPhone is disconnected"
But the device is connected and the backup is not performed.
I've read several tutorials, but there is NO to this specific problem.
Someone has been there, or know how to solve?
hug;
Thiago

Answer 1

Hi Chalmita,
For your immediate issue of the MacBook Air not shutting down, try the following:
OS X Yosemite: Log out, sleep, restart, and shut down
https://support.apple.com/kb/PH18786?locale=en_US
Hold down the power button until you see the restart, sleep, or shut down dialog, then click Shut Down, or press Return.
If you don’t want the app windows you currently have open to reopen when you restart your Mac and sign in, deselect “Reopen windows when logging back in.”
If your Mac won’t shut down, press and hold the power button for 5 seconds to force a shutdown.
Important:   If you force a shutdown, you may lose unsaved changes in open documents.
The Mac is completely shut down when there is a black screen, no active power light, and no fan or drive noise.
What version of OS X do you have on your Mac?  It might be helpful to back up your computer with Time Machine and update to the latest version, which is 10.0.3.  Do the same with your iPhones so that everything is up to date.
Update OS X and App Store apps on your Mac - Apple Support
https://support.apple.com/en-us/HT201541
Update the iOS software on your iPhone, iPad, and iPod touch - Apple Support
https://support.apple.com/en-us/HT204204
Cheers!
- Judy