Thunderbolt Display suddenly no longer recognized by my MBA

I have been using the thunderbolt display with my Mid 2011 Macbook Air (13inch). Everything worked fine. Now suddenly when I plug in the monitor the macbook does not recognize it. In System Information:Thunderbolt it says it is not connected to anything:
MacBook Air:
Vendor Name:          Apple, Inc.
Device Name:          MacBook Air
UID:          0x0001000C12AC2000
Firmware Version:          8.1
Port:
Status:          No devices connected
Link Status:          7
I know there is power to the display, as I have been using the display's cable to charge the MBA (as I've always done).
I don't know how to diagnose the issue further. Nothing else is connected to monitor or computer. Restarted many times. All cables look fine. All software up to date. (not sure about any display firmware...). Clamshell or as additional display.

Try the other DVI port on the graphics card. On early Mac Pros, only one port is the dual-link DVI needed for full resolution on the 30" display. Make sure the display's USB cable is plugged into the computer.

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Tanks,
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Hey bertinot,
Thanks for the question. I understand you are experiencing issues with your Thunderbolt Display. The following resource may help to resolve your issue:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Thanks,
Matt M.

1 Thunderbolt display suddenly has green everywhere.

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~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
 Cheers, Tom

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