Imessaging won't work after yosemite update...how do I fix this?

I'm connected to wi-fi, yet imessages won't send or receive. It worked until I updated my MacPro to Yosemite. How do I fix this?

Not knowing what you have tried.
What does Wireless Diagnostics show?
Wireless Diagnostics
Wi-FI connection drops
Wi-Fi Problems in OS X Yosemite
Wi-Fi Problems in OS X Yosemite (2)
Wi-Fi Problems in OS X Yosemite (3)
WiFi Potential Temporary fix - Yosemite
Also try turning off Bluetooth.

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