HT5395 Could not sign in to iMessage. An error occurred during activation. Try again.

I haven't been able to use Messages on the computer for several months. My Apple id works for Facetime, iTunes and iCloud on all my devices. iMessages works on my iPhone 4S. I just can't use in onmy computer. It used to work. Somewhere after an update of Mt Lion, it stopped. I'm on Mavericks now.

Hi,
At the OS X 10.8.2 update the iMessages account in Messages needs your Serial Number to be on the logic/mother board.
If this has ever been replaced and the number not "flashed" to the new board then iMessages will not connect to the server.
Use the Apple Icon Menu and About this Mac.
In that window click twice on the line that states the current OS level
This will change to the build number (another way Apple counts the OS version) and then to the Serial Number.
If it is messing you will need to visit an Apple Store or an Apple Authorise Service Provider (AASP) and have the Serial Number installed.
10:02 pm      Thursday; December 19, 2013
  iMac 2.5Ghz 5i 2011 (Mavericks 10.9)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad

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