impossible to login to iMessage on Yosemite - can connect on FaceTime but

Yesterday, I upgraded to El Capitan and had to downgrade to Yosemite because of stability issues that seem related to the material in early 2009 with several video cards.  Downgraded to Yosemite (my previous config before ElCapitan, using Time Machine and everything works fine except imessage.  I can not connect with my specific password App.  Same password works with FaceTime.  iCloud in the calendar, email, contacts, faceTime, etc. work.  Just cannot connect to the iMessage.  Created app specific new password to see if the difference.  Works with FaceTime, but not with imessage.  Seen the suggestion to change the time zones can switch back, and then restart your computer.  Tried, but failed.  I was able to connect on iMessage before the upgrade and downgrade so do not know if the upgrade triggers something in icloud on end of Apple or not.

Execution of Yosemite 10.10.5 on Mac Pro (early 2009).

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Hello

Try a reset of the NVRAM.

Press CMD + ALT + P + R at startup until you hear three Start Up bongs.

So let Start up continue normally.

21:11 Friday; 27 November 2015

 iMac 2.5 Ghz i5 2011 (Mavericks) 10.9
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro (Snow Leopard 10.6.8) 2 GB
 Mac OS X (10.6.8).
 a few iPhones and an iPad

Tags: Mac OS & System Software

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