Message starts with the iMessage login screen

Mac OS X Sierra Message app starts with an iMessage login screen, however; When I get my good Apple ID and password, nothing happens.  When I enter incorrect information, it appears with a red warning text indicating that Apple & /or password ID are incorrect.

How to past the login screen?  My information is correct, but the program will not always be in front of the login screen

Hello

He was working before you upgrade to the Sierra?

No chance that your logic/mother Board has been replaced?

This keeps the serial number of the Mac and is used to provide a specific connection of the device.

Go to the Menu icon Apple and select about this Mac.

Tab preview is to display the serial number.  (if this is not you must go to an Apple Store or the repairer so it will be again).

Go to the menu icon Apple once again, but hold down the ALT key and select System Info.

Open Hardware > network > locations

The list on the right list en0 for one of your connections?

On the old Mac en0 was Ethernet and Wi - Fi and Thunderbolt on newer Gets the following figures.

There are some Mac without Ethernet en0 so can Wifi

You can also look in Applications/Utilities and open the network utility and use the Info tab and fall down.

Is missing the en0 then you need to remove some system side .plists and restart the Mac.

I saw some information to remove all these

Note the path bar across the bottom.

Simply remove the Airport (WiFi), one maybe.

If they did not work, then after that the appeal of Apple process is lengthy to explain.

(you can get blocked by devices and this requires the server reset on your Apple ID on a single device)

21:42 Thursday; September 22, 2016

 iMac 2.5 Ghz i5 2011 (El Capitan)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro (Snow Leopard 10.6.8) 2 GB
 Mac OS X (10.6.8).
 iPhone and iPad (2)

Tags: Mac OS & System Software

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