how may i mirror the screen of my mac pro 10.7.5 with apple tv 1?

Hello renato machado luz,

Thanks for using Apple Support Communities.

To be able to use AirPlay between a Mac and Apple TV, your devices will need to fit the requirements below. As the requirements below show, your current configuration does not support AirPlay to mirror your display on an Apple TV.

Requirements for AirPlay in OS X

An Apple TV

• Apple TV (2nd generation or later) with software update v5.0 or later.
• AirPlay turned on in the Settings menu of the Apple TV.

A supported Mac

AirPlay Mirroring in OS X takes advantage of the hardware capabilities of recent Macs to deliver high frame rates while maintaining optimal system performance. The following Mac models support AirPlay Mirroring when using OS X Mountain Lion or later:

• iMac (Mid 2011 or newer)
• Mac mini (Mid 2011 or newer)
• MacBook Air (Mid 2011 or newer)
• MacBook Pro (Early 2011 or newer)
• Mac Pro (Late 2013 or newer)

About AirPlay Mirroring in OS X - Apple Support

Take care,

Alex H.