Second Graphics card not recognized

[Leviathan696]

So I’ve been gaming on my computer for a couple years now and just recently i had a problem where my second graphics card won’t show up, one day it was fine the next it wasn’t. Tried updating drivers, updated my bios, switching cables, and switching the cards to make sure the pcie slot wasn’t dead, it wasn’t, and both of the graphics cards work by themselves too. Since it’s water cooled on a custom loop, I got both of the graphics cards to show up before i assembled the system and put it back in but as soon as the completed system was together they both wouldn’t show up. I’m running two 970’s on an Asus Maximus VIII Hero with an intel i7 6700k powered by a 1000W Evga PSU on windows 10.