Decklink SDI undetected

Hi everyone!

I know I've got something old, but please help me with this, I don't know what to do anymore!

I own a Blackmagic Decklink SDI (BDLKSDI) which I used in a HP Compaq computer without any problems. I've just bought a HP ProDesk 600 G1 and I've plugged my Decklink into the PCI-e x1 slot number 2. Neither Media Express or Windows Device Manager detect it. I've tried all of the PCI-e slots and I ran into the same situation, excepted the PCI-e 16x slot. It works perfectly when plugged there. However, I can't leave it there since my GPU will need this slot.

I've put the BIOS to factory defaults and updated it, what could I do now? I've listed my hardware at the bottom.

Thank you very much for your help, it's going to be really appreciated!

Maxime Cossette

HP ProDesk 600 G1
Intel Core i5 4590 3.3GHz
8GB RAM DDR3
Samsung 850 EVO 500GB SSD
WD Black 1TB HDD
Windows 10 Pro

Update! I've found how to fix this. I went to my BIOS, and there is a kind of power plan for PCI devices. I've disabled this option and now, everything works fine!

I hope it could relief someone from a headache!