TDM is not working between my MacBook Air and iMac (2011m Mac OS X, 10.6.8).

The thunderbolt cable connects the MacBook Air and the iMac. System requirements are fulfilled but the shortkey provided in Apple FAQ does nothing.. Neither cmd F2 nor cmd fn F2
Any ideas?
Thanks!

The thunderbolt cable connects the MacBook Air and the iMac. System requirements are fulfilled but the shortkey provided in Apple FAQ does nothing.. Neither cmd F2 nor cmd fn F2
Any ideas?
Thanks!

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