This process is only for those digital signs on campus that are served with a Chromebit (most of which with content managed in Cascade).
The Chromebit is a device plugged into an HDMI port on the back of the TV. It's only purpose is to get a web page and display it on the screen. If you see a message on the screen that says "no signal" or something similar, it just means that the Chromebit has lost its connection to the network. This error is very common after a network or power outage. It can also happen if there is an issue with the web page that it's trying to access.
We configure our Chromebits to get the web page once every two minutes. Therefore, often you can handle such an error by just waiting, knowing that the Chromebit will try again in two minutes.
If you know the network and power are fine, you can also reset it by unplugging the small power cord from the side of the Chromebit, wait a few seconds, then plug it back in.
If you continue to have troubles, just let us know and we'll take a look.