air play on imac
I have a mid-year 2011 iMac with Mac OS X Lion 10.7.5 and just bought Apple TV. I got everything set up, but I have no air play icon on my iMac. Everything I've read says that my model should work fine, but there is no icon. I've tried going into system preferences> displays, and that still didn't work. Please help!
iMac, Mac OS X (10.7.5)