I am receiving a "no signal". I have switched cords around, unplugged, but still no signal. Ideas?

Post your TV brand and model number, Apple Tv model number, and the setup - cables used and connections tried.

This will allow specific suggestions.

Also what is the status of the light on the ATV - off, on steady, blinking?

Finally is this the first time you used it or did it work before?

You can also try to work though this nice troubleshooting guide first:

Get help with audio, video, or power on Apple TV - Apple Support