Hi guys! I just bought a Samsung 950 PRO M.2 ssd and a Lycom DT-120 pcie card for my Mac Pro 5,1. And here's the problem: I installed everything on pcie slot 3 but the Mac now doesn't boot. It shows me the white screen but I'm not able to boot normally into my El Capitan (installed in the tray 1) and even if I press the alt button, nothing happens. So, I tried to remove the DT-120 and it boots normally. Then I tried to put back the DT-120 but without the 950 PRO and it boots normally again. What's wrong with that? Could it be a damaged SSD? Or maybe I should do something before? Thank you!