Hopped on my iMac this morning and suddenly I can no longer text my wife on her iPhone from my iMac. After a minute or so of poking around, I got it fixed.
I clicked on Messages, then Accounts, and saw that iMessage was greyed out. Somehow my iMessage account disabled itself. It’s an easy fix.
In the Messages app:
- Click Messages
- Click Preferences
- Click the Accounts Tab
- Select your iMessage account
- Re-enter your Apple ID and/or password
- Enable this account should be checked
And you should be all set!