IMessages stopped working on my Macbook Pro

Last week I sent my Macbook Pro to have a new logic board installed into it. When it came back, everything seems to be working just as it did before, except  my Messages application (the one you can sync to your phone and text iMessages through) no longer works! I'm not sure if this is because the technicians performed a routine update, if something is wrong with my software, or what...
Here's what happens:
When I try to send a message, a red exclamation point shows up to the right of the message and a prompt saying, "Your message could not be sent. Click 'Try Again' to send this message." And when I click "Try Again," the same red exclamation mark shows up next to the message, etc, etc.
Can anyone provide a few examples of how to fix this? Thank you!

From the menu bar, select
           ▹ About This Mac
Below the "OS X" legend in the window that opens, the OS version appears. Click the version line twice to display the serial number. If the number is missing or invalid according to this web form, take the machine to an Apple Store or other authorized service center to have the problem corrected.

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