I am using an ATEM1 Mixer for our church productions for the last 8 months. We used to use only the three HDMI inputs as we had only three cameras. Recently we had purchased one more camera and plugged it into the fourth HDMI input with the correct settings. However, there is no signal on the fourth channel. We have tried all sorts of settings and even tried connecting a camera that is working on the other channels, but couldn't see that camera either.
Could this be a hardware error or some firmware errors ? My firmware is 4.1
Liam are correct, I´ll missed that you had the 1 ME. The only solution left are if you for some reason started with input 4 and the one you didn´t use until now are input 1. That one are also shared with the component input so check that input 1 - 4 are all HDMI in the Atem software. If thats the case you better call support.