Q: My Apple TV responds to my remote by flashing, but nothing changes on screen. How do I fix it?

Howdy there Nick,

Greet

I would recommend these 2 troubleshooting steps.

First, reset the Apple TV with this process:

Restarting your Apple TV without a remote

You can also reset your Apple TV by unplugging it from the power source for thirty seconds.

From: Apple TV (2nd and 3rd generation): How to restart your Apple TV

          http://support.apple.com/kb/ht3180

And if needed, restore the apple tv with this article.

Apple TV (2nd and 3rd generation): Restoring your Apple TV

http://support.apple.com/kb/HT4367

Cheers,

Sterling