I did RMA the GPU and instantly got a new one from the shop. Good service!
I connected the new GPU with a new riser and all went well.
Glad to hear that you were getting the new replacement card.
The stuff underneath the risers always comes loose because of the heat in the (open) rig:-(
Doesn't anybody else have this problem? So all of my risers are 'naked but I'm really careful not to short anything. And this was not what caused my problem.
What material of your open-air rig by the way?
as above said, usually the Risers have the insulator materials in the bottom side (how about yours?) If your rig case made from insulator materials (such as wood) you don't need to worry.