I updated my Apple TV to 5.3 and now it doesn't work. It only shows a computer and General settings to choose from. Can someone please help me.

 

Welcome to the Apple Community.
That tells you it's not connected to the internet properly.
Try the following steps, check whether things are working after each step where appropriate, before trying the next.
Restart the Apple TV (Settings > General > Restart).
Restart the Apple TV by removing ALL the cables for 30 seconds.
Restart your router.
Reset the Apple TV (Settings > General > Reset > Reset all settings)
Restore the Apple TV (Settings > General > Reset > Restore)

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