Problem with risers(?)

Hi, I'm trying to setup a few rigs, but I'm having a big problem..

I've been going at this for 10 hours straight now, can't seem to figure out what the problem is.

When i connect a gpu(RX 470) with a 1x16 usb riser, the drivers just crashes, sometimes I get a bluescreen, sometimes not.
I've never been able to mine though.

Mobo: asrock h1 btc
gpu: xfx 470 4gb single fan

I've tried 3 mobos, 4-5 gpus, 3-4 risers, all h81's and rx 470's (all new and never used ones).
Edit: Also tried different psu's

I've also tried using one of the gpu's and risers on a different mobo (ASUS Z97-A), and It worked just fine.

So it seems to be a problem or specific step that I've missed while using risers with h1 btc.

I've done a fresh install of windows 4 times, still no luck.

I really need some help