I just purchased a new appletv, but before hand i had called apple to see if it would work using my late 2009 Imac. the answer was yes. it doesn't work am i doing doing something wrong or was i just given the wrong information.
iMac
Posted on Jan 4, 2014 10:38 PM
Q: air play with late 2009 iMac ?
it works with airplay audio
it works with shared itune lib
it does not work with airplay mirror
http://support.apple.com/kb/HT5404?viewlocale=en_US&locale=en_US
people say that older macs can mirror the screen using the program airparrot