Cannot send iMessage from MacBook Pro I have been using my MacBook Pro for nearly 2 years. I have no problem using iMessages both on my iPhone and Mac. However, today, I can't seem to be able to send any messages out from my Mac. There is no problem on my phone. Also, I cannot use FaceTime on my Mac.

I reviewed through the internet for some solutions, but nothing seems to work, such as deleting files, changing setting on the Flash Player.

How can I resolve this issue?
It has something to do with not having a serial number on your Mac (after motherboard repair or so). You need to go to an Apple Store to have it “flashed” back. iMessage and FaceTime won't work without the serial.