No Video Signal
This alert is built right into the Preview/Adjust Monitor (figure 1).
figure 1: The No Video Signal Alert
During normal operation, the Preview/Adjust Monitor shows you the output of the video source connected to Snappy. When Snappy is unable to detect a video signal, the Preview/Adjust Monitor will be filled with video snow, or noise. If you see this, you should check the power to Snappy and on your video source and all video cables to Snappy.
Don’t even try to snap an image if you see snow, because you know what you’ll get. Yep. The dreaded No Video Signal Detected message.