I have a brand new decklink extreme and a brand new Mac Pro desktop. It has the correct ver. of OS, etc.
I install the card in the top slot.
I download the latest driver/installation software
I restart the computer and hangs right after the background for the desktop becomes visible. Nothing else shows up. No drives. Nothing.
So, I start in "safe' mode. uninstall the software. Computer works fine... I worked with Blackmagic support for days. They suggested that I install as above. Restart in Safe mode and then put the driver out on th the desktop. Then reboot normally and put the driver back in the correct folder. Only problem is it wont boot up. Again, it hangs up in the same place.
Black magic replaced the card. But I still have the same problem.
A couple of thoughts come to mind. Do you have anything else hooked up to the Mac such as an external Hard Drive, scanner, ect? If so, unplug those extra devices and try startup again. Did you happen to install any other third-party software besides BlackMagic drivers when you got this new Mac? If so, that could be causing problems. Lastly, you could try re-installing the OS in the event it has become corrupted.