I feel the same I have just updated from snow leopard to ML now the mac mini will not shut down properly. But instead of pulling out the HDMI from the Samsung tv, I find that if I hit the shut down button from the side bar, them put the tv on stand by and wait the 1 minute to shut down it will not start up again.
I have sent lots of reports to Apple but no fix seems to on the way.
I have sent lots of reports to Apple but no fix seems to on the way.