IMac Late 2012 will NOT display airplay mirroring icon in the toolbar.

Here's what i have:
Late 2012 21.5 inch iMac
2.7 GHz Intel Core i5
8 GB 1600 MHz DDR3
NVIDIA GeForce GT 640M 512 MB
I used to have the Airplay icon in the upper right hand corner of the screen dispkayed, but i had a strange reset a month ago, and now the icon wont come back. I have reset my apple TV, Airport extreme, and imac numerous times, but can;t seem to get it to work.
Here are my display settings:
and the empty toolbar (but i'm sure you don't need it):
Haven't been able to mirror my iMac since it crashed. Any help would be appreciated. Thank you!

About AirPlay Mirroring in OS X
Make sure that AirPlay is turned on in the settings menu of the Apple TV.
If you use a firewall, make sure the following firewall security options have been set to allow AirPlay Mirroring to work:
Choose System Preferences from the Apple menu ().
Click Security & Privacy, then click Firewall.
Click the lock icon to unlock it if it's locked, then type an administrator name and password.
Click Firewall Options.
Deselect (uncheck) the “Block all incoming connections” checkbox.
Select (check) the “Automatically allow signed software to receive incoming connections” checkbox.

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