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Two questions actually: 

1. How do I change carriers on my surfboard 7400? 

2. My adult son turned the lights off on the 7400 so how do I turn them back on?

You are stating carrier as your Internet service provider? If yes you need to contact your service provider regarding changing account.

To turn ON the LED light on the front panel of the modem can be done by following steps mentioned on the below article

http://arris.force.com/consumers/articles/General_FAQs/SBG7400AC2-Turn-Off-the-LED-Lights