Q: Carnt play videos on apple tv

Hello, Oris67. 

Thank you for visiting Apple Support Communities.

Sometimes closing all applications in multitasking, power cycling the device and all other AirPlay components can resolve the issue.  However, further troubleshooting may be needed.  Here are the best articles to help you troubleshoot this issue.

iOS: Force an app to close

http://support.apple.com/kb/ht5137

iOS: Troubleshooting AirPlay and AirPlay Mirroring

http://support.apple.com/kb/TS4215

Cheers,

Jason H.