At the moment, when the system power is switched off (or the ATEM is otherwise not connected), there's no visible indication of the situation until you try to perform a switching operation and get a dialog box pop up.
We could potentially have a "system power is switched off" screen instead of the video switcher component (leaving the buttons at the bottom of the screen for power, blinds etc still accessible), that is replaced by the video switcher when the ATEM is connected.
My only (mild) concern is that if something in the system was misbehaving then it could end up erroneously blocking users from accessing switching functions. I'm not sure there's any foundation to that though, since if the ATEM is reported as not connected, having access to the buttons won't help you...
An alternative could be to start displaying this screen at the end of the system power-down sequence, and stop displaying it at the end of the system power-on sequence (perhaps with a "leave me alone, I know what I'm doing" button to get rid of it without power cycling).
Having this screen would avoid (for example) me getting phone calls that go:
"I can't get anything to display on the screens."
"Have you turned the system power on?"
"... Oh, that would be why, then..."
At the moment, when the system power is switched off (or the ATEM is otherwise not connected), there's no visible indication of the situation until you try to perform a switching operation and get a dialog box pop up.
We could potentially have a "system power is switched off" screen instead of the video switcher component (leaving the buttons at the bottom of the screen for power, blinds etc still accessible), that is replaced by the video switcher when the ATEM is connected.
My only (mild) concern is that if something in the system was misbehaving then it could end up erroneously blocking users from accessing switching functions. I'm not sure there's any foundation to that though, since if the ATEM is reported as not connected, having access to the buttons won't help you...
An alternative could be to start displaying this screen at the end of the system power-down sequence, and stop displaying it at the end of the system power-on sequence (perhaps with a "leave me alone, I know what I'm doing" button to get rid of it without power cycling).
Having this screen would avoid (for example) me getting phone calls that go: