Black screen or nothing plays

1. Working hours: outside them the screen is black on purpose. Check Working hours.
2. Turned off: the screen may be turned off from the panel. Turn it on from its page.
3. Nothing to play: the default playlist may be empty, or every item may be outside its show dates or expired. Check the playlist.
4. Schedules: a schedule with an empty playlist may be active now. Check the calendar on Schedules.
5. Plan: content your plan doesn't include (for example an app) is skipped.
6. Account paused: a locked account shows the company name and a "Paused" badge.

Use the screen's live picture and Now playing on its page to see what it thinks it should play.