Why won't my Macbook Pro Retina not hook up to Air Play Via Apple TV

So I want to hook up my laptop to the TV. Now Everything is up to date and my model is 2013 computer and the latest addition of the Apple TV Product. I have the top icon on my screen and click on my name, enter my password, but then it says it cannot connect. Now my internet is wireless at a campus, but other kids got it hooked up easy over wireless. I don't know what I am doing wrong. I went into settings trying to get rid of any blocks and home sharing is on, so I am stumped. Please Help!

Hello again,
I believe the update was: MacBook Pro EFI Firmware Update 1.2
Thanks!
Becky
imac G4 MacBook Pro Mac OS X (10.4.8)

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http://support.apple.com/kb/ht1573#1
No video or no signal, image distortion, "snow," or flickering
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Monitor and Display Adapter Table
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Apple Mini DisplayPort adapters: Frequently asked questions (FAQ)
Thunderbolt ports and displays: Frequently asked questions (FAQ)
Remove all display cable extenders, KVM switches, or other like devices and retest to determine if the issue is resolved.
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