Apple TV will not connect or recognize my computer

What finally fixed my problem:

1. Turned off sharing in all computers using Mac iTunes.

2. Unplugged my Airport Extreme router, left off.

3. Turned on Sharing on the iMac I wanted the iTV to see.

4. Replugged in the Airport Extreme.

5. Then spend Computer on iTV and the iMac was there in all its glory.

All have worked correctly since.

That is the sharing tab in iTunes preferences, which has nothing to do with Apple TV. You need to go to file - home sharing.

Within iTunes, file - home sharing

Since upgrading my iMac to a new El Capitan OS, my iTV does not see my computer. It asks for me to turn on Home Sharing within my iTunes on my iMac, which I have done. I am trying to watch a slideshow created in Photos. I can see no way to move that slide show from Projects in Photos to iTunes, but that is a secondary issue.The primary issue is seeing my computer.

make sure OS X firewall and router still allowed the required ports to be used

TCP and UDP ports and protocols used by Apple TV - Apple Support

I am having the same issue. However I did not upgrade to El Capitan but to Yosemite. Also the HD was replaced in the Macbook pro the Apple TV will not see. Since I have multiple mac in my home I have checked to see that -

1. Apple TV will see the library of another Imac running The same OS as the MBP (Apple TV is sharing with other macs)

2. The other macs in our home can see the MBP itunes library (The shared library is sharing to other devices)

It is only the newly upgraded MBP will not be seen by the Apple TV.

I have

• checked to be sure all devices have the latest updates

• Turned sharing on & off on both devices and restarted both devices multiple times

• Deauthorized and reauthorized the MBP

• repaired permissions on the MBP HD (just for kicks)

Still no dice. And prior to the MBP updates there was no issues.

Any ideas would be appreciated.

What finally fixed my problem:

1. Turned off sharing in all computers using Mac iTunes.

2. Unplugged my Airport Extreme router, left off.

3. Turned on Sharing on the iMac I wanted the iTV to see.

4. Replugged in the Airport Extreme.

5. Then went to Computer on iTV and the iMac was there in all its glory.

All have worked correctly since.

Bruce

Thanks Bruce

I gave it a try but no luck.

I am going to try resetting Apple TV and see if that helps.

Carl