Ok, try this one on for size.
While trying all this i hadn't logged into iCloud. Once i logged into iCloud, iMessage started working.
Not sure if i just missed a step at the beginning or what.
Thanks for the great guide!
I am having the same issue as ako. I have tried every solution i can find on the forums in order to get iMessage working. Is there any other possible solutions?
One last item. I currently have my laptop on a dock with two monitors, but it is only displaying on one. Has anybody attempted this?