Mac won't connect to tb display

Hello,
I connected my mid 2009 macbook pro 13 inch with OS X Yosemite to my 27" tb display and nothing happened at all. No change in the screen and no indication that there was any sort of monitor or cord connected to the computer. I tried to detect displays, still nothing. I restarted, still nothing. I pretty much did everything I could think of, and still nothing. Could this be my output on the computer itself, because I tested the display with a different monitor, and it worked perfectly. Please help. Thanks in advance.
Will

Open System Preferences > Security then select the Firewall tab.
Make sure the Firewall is off.
If you need to make changes, click the lock icon. You may be prompted for you admin password.
And if you have anti virus software installed, disable that.
BTW... when you post a question, please tell us which Mac OS X you have installed. Thank you!

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Mac won't connect to tb display

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