Q: iMessage activation issue - Please Help

Hi Guys

It's been two days that I have problem with iMessage. I am a Yosemite Beta tester. I had to re-install 10.10 on a new harddisk i purchased. So I re-installed Mac and iMessage has stuck in activation. I thought it might be due Beta version. So I installed a refresh 10.9 on another hard drive. The same problem. iMessage still functioning on iOS 8 I am testing on my iPhone 5C, but the app on both Mavericks and Yosemite is still getting error in activation. Sometimes it happens that after inserting password for activation, it receives the registered emails and phone numbers, however the app remains as inactive and all registered emails and phone number disappear in a flash, going back to Activation Window again.

Does anyone have this problem?

Thanks

Bob

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Mac Pro (Mid 2010)

Processor 2.8 GHz Quad-Core Inter Xeon

Memory 16 GB 1066 MHz DDR3

Graphics ATI Radeon HD 5770 1024 MB

Routers Airport Extreme and Airport Time Machine