simple cable?

Since the PCI Express slot has been obscured by the graphics card, me the solution to the ribbon cable seemed to be a good solution to connect a small USB3.0 card. It's "only" a cable connection.
Unfortunately, the ribbon cable is not does not work, at least in this function with my USB3.0 card. There was the strangest reactions to freeze the screen and cold start. After many long attempts I found that it is not due to the USB3.0 card, but on the ribbon cable.
A point there for the quick delivery and the optically fine workmanship.