I'm trying to set up my Facetime but I'm getting a message that says my registering device does not have appropriate credentials

I'm trying to set up my Facetime on my laptop but I'm getting an error message that says my registering device does not have appropriate credentials. How can I fix this?

katharina,
The specific circuit board I was talking about is the "Logic Board" which should have the serial number of your computer embeded electronnicaly.  Sometimes the technicians who replace this board do not bother to enter the computer's serial number into it after making the repair/replacement.  Probably because they don't think that it is important.  The only way you can have this done is to bring it back to the shop where it was repaired, and have them do it. On some Macs you can check the electronic serial number by clicking on the Apple logo on the top left hand corner of the screen, then clicking on "about this mac" then clicking on "more info" button on the window which will appear.  If you can't see any serial number, then your replacement board was not serialized.

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