After the installation of Sierra bugs

I have some problems with icloud, safari, app store and itunes after the upgrade to Sierra.

iCloud: unable to connect to the server.

Safari: I can open the safari but unable to navigate a Web site, there always blank page, but I use chrome to browse all pages.

AppStore: I can open the app store, but there is noting in this respect, it looks impossible to connect to the server.

iTunes: I can open the itunes, but there is nothing about it. It will crash after 1 minute. I download the new version of the apple Web site, but still does not.

Anyone know what happened?

Thank you!

Start in Recovery (command-R) and the menu drop down utilities, run disk utility > disk first aid on your Macintosh HD recovery http://support.apple.com/kb/HT4718

If that does not solve the problem, start Recovery and re - install the macOS on top of your existing macOS

Tags: Mac OS & System Software

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