iMessage Problems

Hi! I'm running macOS High Sierra 10.13.2. I've been trying to get iMessage working since I installed, since it's one of the main reasons I use Apple products. I've tried every guide I've found, including the one on Reddit and the one on tonymacosx86.com. None of them work--I follow the steps, reboot, and get the same result I always do, which is greyed-out buttons for a few seconds at login, then a "could not sign in to iMessage" prompt. I need help. I'm using the system definition iMac18,3, and I have a serial number that is supposedly compatible.

submitted by /u/mrflounderthethird
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