Currently Being ModeratedJun 13, 2013 3:16 PM (in response to Sid Of The Suburbs)
All my Macs (5) are too old to mirror too, even my 8 core Mac Pro.
The issue relates to Apple utilising a hardware feature of modern Intel processors to perform what is effectively screen sharing with variable quality.
I suspect many recent machines could do the job in software but Apple have not implemented a software solution.
Airparrot is one possible software solution to try - demo it as results are variably reported.
Beamer is another option to look at but it never worked for me.