How can I connect my MBA 11" 2012  to my Imac 21.5" mid 2010 as a display unit. Connected using a mini display port cable and this did not work. Any guidance welcome. Thanks. John

I bought a belkin mini display unit cable( new) and connected the thunderbolt port in the MBA ( 11" , mid 2012) to the Imac mini display unit port using this cable. Pressed the CMD & F2 keys on the Imac keyboard as required but this did not work. Should I try with another cable ? Should i try with a thunderbolt cable ( recommended by appple support ) -- but they too were not sure about this. Is the Mid 2010 21.5" Imac not able to function as an display unit? Any guidance would help and will be much appreciated.

Welcome to Apple Support Communities
Only the 27-inch iMac and Mid 2011 and newer iMacs can be used as an external screen, so you can't use your Mac as an external screen. See > http://support.apple.com/kb/PH11302
You can still use your iMac as an external display, using an application like ScreenRecycler

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