Having trouble with Target Display (27"iMac2011)

I'm new here and hope that someone can help me.
I just bought a new MacBookPro(December 2014) 15" with Yosemite. It has a thunderbolt port and I'm trying to connect it to my iMac27" (2011) which also has a thunderbolt port. But after hooking both up with the thunderbolt cable (from Apple) and pressing Command+F2 (from my iMac27 keyboard), nothing is happening. I'm running Snow Leopard (10.6.8.) on the iMac27". Could that be the issue? I tried different things but still not getting it to connect. Please help. Thanks in advance.

Hello Wilmocat,
Target Display Mode only requires 10.6.1 or later, so it looks like you're well within specification. Depending on your settings, you may need to use the keyboard combination Command + Fn + F2 rather than Command + F2.
Note: In Keyboard System Preferences, if the checkbox is enabled for "Use all F1, F2, etc. keys as standard functions keys," the key combination changes to Command-Fn-F2.
Target Display Mode: Frequently Asked Questions (FAQ)
http://support.apple.com/en-us/HT3924
Cheers,
Allen

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Message was edited by: Jim Giffin
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