IMessage and FaceTime stops working in iMac after carrier change

Hi all,
I have done a fair bit of googling and had a look at the discussion history here but couldn't find a solution to my problem. Apology if it has been raised and discussed before and I woud appreciate being re-directed to the thread.
I have got iMessage and Face Time running smoothly on my iPad 2 wi-fi, iphone 4S and iMac OX 10.8.4. However, on the day of my changing carrier (17/09/2013), iMessage and FaceTime stopped working on my iMac as well as iPad 2. It can longer recieve or send messages or receive or make Face Time calls. All the settings looked the same - tick mark next to both my Apple ID email and mobile number, and conversation has always been set to start from mobile number on all devices. iMessage and FaceTime continue to work on iphone 4S without any issues. New sim card but same mobile number. I don't worry too much about the iPad. I just want to make it work again on my iMac and appreciate any help anyone can offer.
Steps I have attempted to make iMessage work again (I left Face Time turned off on iphone and iMac during this time)
0) I disabled/removed Bonjour (GTalk) in iMessage setting in iMac
1) I have turned off iMessage and FaceTime on all devices and swtiched iMessage only back on in iphone 4S first and then iMac. I got the message on my iphone that the iMac will start using the mobile number and Apple ID to send iMessages. However, iMac still fails to send or receive messages.
2) I have updated Apple ID on the web (removed the phone number, saved, and then re-entered phone number assoicated with Apple ID). Then repeat #1
3) I have tried changing "start new conversation from Apple ID email" across all devices - did not resolve anything
4) I have added a friend's Apple ID in iMessage on my iMac -mobile number automatically appeared and tick marks for both her mobile and Apple ID email but unable to send or recieve messages still while it continues to work from her iphone
5) I have also done a PRAM reset - I got the 2 chimes - did not resolve the issue
There's a clear trigger for this problem - change of carrier but I don't understand why it is affecting the iMac (and ipad) but not the iphone itself. Does anyone have any ideas what I can do about it?
Thanks for your help in advance.

Hi,
At the OS X 10.8.2 update things regarding the iMessages Account's login were changed.
It now requires that the Mac's Serial Number is held in the Memory for it on the Logic Board.
It can get missed in Refurbishments and Repairs.
This is used to generate the Auth-Token for your Apple ID in the Keychain.
Go to Application/Utilities and open Keychain Access.
In the Login Keychain look for "IDS: (Your Apple ID)-AuthToken"
Double clicking this will open the Info Panel.
Check the Access tab and make sure it is either allowing Any App or lists Messages, IMCore and those in this pic.
Although it is know that the Mac has to list the Serial Number it is not clear if other info is needed.
It is possible that it also refers to your Public IP address in some way, this would seem unlikely as most people's ISP issued IP address is from a DHCP server - you basically keep the same IP as you are "Always On" between the router and the ISP but it can change.
If it is not allowing access then change the settings.
There are also two .plists that contain the word imessages
One of these refers to the server you connect to.
com.apple.imservice.iMessage.plist contains the Info you have in the Preferences of Messages (Apple ID, Linked iPhone Numbers and any additional emails)
com.apple.imessage.bag.plist contains which server at iMessages you connect to.
I would try deleting (drag to Trash) the second of these and then restarting Messages.
If that does not work Quit Messages and delete the AuthToken for your Apple ID (if the AuthToken appeared to be allowing access above.)
Restart Messages.
8:03 pm Sunday; September 22, 2013
 iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.4)
 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
"Limit the Logs to the Bits above Binary Images."  No, Seriously

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IMessage and FaceTime stops working in iMac after carrier change

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