I can login all accounts except imessage on my mac! why?

i tried everything to use imessage after updating my os to mountain lion on my mac but cant solve my problem... can anyone say why i cant use imessage on my mac?.. i can use all my accounts (iCloud, app store, iTunes etc.) using my apple id and have no problems using on my iphone (i can use imessage on my phone) either but when i try to sign in to imessage on my mac i get this message; "The server encountered an error processing registration.Please try again later." for two days. I tried and tried and tried, again and again but i got the same message!... anyone solved this please help!

Back up all data.
Take the steps suggested in this support article:
FaceTime, Game Center, Messages: "There was an error processing registration" when signing in
The time zone must be correct for your location.
Make sure you know your ID (an email address) and password. The password should be in your keychain, which you access in the Keychain Access application.
Sign out of iMessage:
Messages ▹ Preferences ▹ Accounts ▹ Sign out
Then sign back in with your verified credentials.
If you get the same error, try resetting the NVRAM.

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