Hello all, I have searched for days without a fix and am finally turning over to the Apple Veterans here. I purchased a new Apple TV from the apple store. I was assured at the store (after providing my MBP serial number) that my Early-2011 MBP running 10.7.5 will be able to run/do "Airplay" via Apple TV. I am able to do Airplay just fine via both Iphone 5s in the house as well as the Ipad2. I have checked and double checked everything under the sun and still cannot get the "Airplay" option to show up on my desktop bar. I have checked "Display" properties in System Pref and the option to check/uncheck "allow airplay screen mirroring" is not even available. Can someone please help me figure out why 3 different Apple technicians claim that my MBP should be able to do Airplay, yet I can't. What am I missing here? Do I need to upgrade to 10.8 OS? At this point I am willing to try anything.