Some of the small boards that go into the 1x pcie slot are a little loose where it only takes a small bump on the cable to kick a gpu offline. I was trying to find a way to anchor it to the mobo. I see a small hole in the circuit board that could be used to tie it to something, but I am not sure what. Any ideas? Any experience with this? Thanks for any help!!
Try to replace the riser, I bet its the riser that is not fitted well into 1xPCIE, otherwise insert a little piece or rubber just enough to hold the riser into slot.