2 thunderbolt displays worked fine daisy chained, moved one to work in other room, now only one will work. both work independantly or both plugged into my macbook pro.

I have 2 thunderbolt displays and have had them daisy chained for months where I only would plug one into my macbook pro 15" retina and both displays have worked great. The other day I moved one of them into the conference room, connected also a HDMI cord to a projector to do some work with staff on software design.
I brought my thunderbolt back into my office and plugged it back into the other thunderbolt dispay, then plugged the other display back into my macbook and started it up and now I can only get one to work daisy chained. They both work great independantly or if both of them are plugged into my macbook pro, but not daisy chained any longer.
Is there a setting I need to look at to maybe reset so that my macbook pro will use both thunderbolt displays daisy chained?
Thanks for anyones advice and sharing any similar issues and how you fixed the issue.

Hi there,
The first thing that I would recomend is resetting the PRAM on your portable.
OS X Mountain Lion: Reset your computer’s PRAM
http://support.apple.com/kb/ph11243
If the issues persist, then you may need to force the device to detect displays.
OS X Mountain Lion: About the Display pane of System Preferences
http://support.apple.com/kb/ht5369
How can I detect displays?
If the detect displays option is not available, hold down the Option key while you are in the Display pane.
- Griff W.

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