HT204291 I have 2 mac pros , one can mirror ok but the other shows a lock on the apple tv icon list

Cant get both macs to mirror to apple tv , the one with the problem , in itunes shows apple tv in list
but has a lock by it and cannot figure it out. Have tried home sharing and things but alas , no .

Mac Pros can't mirror, some Macbook Pros can.
To mirror you must be running Mountain Lion (OS X 10.8) or higher, and the hardware must be new enough. See:
AirPlay Mirroring
Requires a second-generation Apple TV or later. Supports the following Mac models:
iMac (Mid 2011 or newer)
Mac mini (Mid 2011 or newer)
MacBook Air (Mid 2011 or newer)
MacBook Pro (Early 2011 or newer)

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