Ultrastudio 4K mini defected - not powering on

Hi guys,
I have a blackmagic New UltraStudio 4K Mini that worked fine before. But today, when I am trying to power on it, it displays a black screen. I have checked all the cable and trying a thousand times to unplug and plug the power cable, but there is nothing happen.
This is the link of video : https://shorturl.at/BFGPU
Any idea?
Thanks in advance.
I have a blackmagic New UltraStudio 4K Mini that worked fine before. But today, when I am trying to power on it, it displays a black screen. I have checked all the cable and trying a thousand times to unplug and plug the power cable, but there is nothing happen.
This is the link of video : https://shorturl.at/BFGPU
Any idea?
Thanks in advance.