Thunderbolt Not Working

I have had MacBook Air and MackBook Pro and love the products   I now have a brand new MacBook Air and each night when i get home from work, I plugin the Thunderbolt to HDMI connector and connect my Dell P2210 monitor.  Tonight when I get home, the monitor gave an error message that no signal was coming from the laptop.  I chcked the system information and the port status was no device connected.  The firmware version is 23.6.  I am using OS X Mavericks 10.9.1.
Can anyone help me?

Hey tnw007,
Thanks for the question. I understand you are experiencing issues with an external display and your MacBook Air. The following resource may provide a solution:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
While you should give all of the troubleshooting steps a whirl, definitely make sure to follow the steps in this section:
Reset the system
You can reset the Mac's parameter RAM and SMC.
Thanks,
Matt M.

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