I currently have two Panasonic V700s going into a Television Studio, and would like to add the output of an iMac to the mix. I've tried two separate mini display to hdmi adapter, multiple hdmi cables- no dice. I've unplugged everything but the iMac hdmi to the switcher- still nothing. I've restarted the iMac after plugging it in, changed my display settings to 1080i, 720p, 720x576, 480i and p. (50 and 60HZ)
The thing is, the iMac sees it correctly as a display (named BMD HDMI), and when it's set to 1080i 60HZ, I get a brief 3 second computer desktop input to the ATEM. Then it goes black again.