I have 2 macbooks, and my thunderbolt display won't work on one. HELP!

I have to Macbook Pros. The one for my work is connected to my Thunderbolt. When I tried to connect my personal one to watch a movie, it won't connect. I tried "detect displays" and "gather displays" - nothing.
HELP!!
Dana

Welcome to the Apple Support Communities
Note that the Thunderbolt Display can only work with Macs with Thunderbolt ports (Early 2011 and newer MacBook Pro). If your Mac is older, it won't connect to this display.
To check what MacBook Pro you have, see > http://support.apple.com/kb/ht4132 If you have a Mid 2010 or older MacBook Pro, you can't use it with your Thunderbolt Display

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