Check there is a valid signal by checking the input menu ensuring all fields display a green tick.
Check the input signal is set to what you would like from the input menu: Progressive, Progressive with 2:2 or 3:2 pulldown (1080i inputs only), Interlaced (HD Only)
If you see No Input for any reason please check your camera settings match a supported format for your Atomos device. The formats supported for each product are listed in the specifications section of each product at atomos.com
Connect any additional Analogue audio inputs and adjust gain accordingly.
Check you have the correct audio channels in record, set to you required from the audio panel.
Connect headphones and monitor the audio channels to make sure the sound is as expected
Ensure the video is coming in as expected. Make sure the signal is clean and does not have any GUI overlays from the camera.
Check you have the correct Scene & Shot number selected, this can be adjusted by tapping the file name at the top of the screen.
Check your drive is inserted and has been formatted in the Atomos unit
Check your Timecode and trigger settings are as required