Hi Mike,
The first thing I would suggest checking is whether the HDMI output of the computer is HDCP protected. If it is, I’m afraid it’s likely it would not output to a capture device like the Intensity Extreme. There’s generally information about this in the computer or graphics card’s specifications, or manual. I believe some graphics adapters will also display the HDCP status in their control panels.
Otherwise, you will want to make sure the computer’s output resolution and refresh rate matches exactly the capture format selected in Media Express or FCP. So for 720p50, you will want to set the computer’s display resolution to 1280×720 @ 50Hz on the output going to the Intensity Extreme. If you’re using a Windows PC, you will probably want to use the Advanced settings from the Display section of Control Panel. Under the ‘Adapter’ tab you should find a button labeled ‘list all modes’. This will help select the right format.
If you’re still having trouble I would suggest calling your regional support team using the numbers on the following page
https://www.blackmagic-design.com/company/
Or by sending a support request via the Intensity Extreme’s support page on the website
https://www.blackmagic-design.com/support/
Chris Pearse
Technical Support Consultant
Blackmagic Design