I'm using a Gigabyte Nvidia GTX 1050 on a powered riser and when i try to mine the PC restarts. The GPU does not have a 6 pin connector on it, it should be powered by the riser. The riser is powered with a MOLEX connector with an adapter from SATA to MOLEX which came with it. I tried connecting the riser to the PCI x1 slot and the PCI x16 slot (I made sure it was plugged in the right way) and it still does not work. But if i plug in the GPU directly to the PCI x16 slot without a riser it works.

I forgot to mention that when i plug in the GPU on the riser and start the PC the fans work for some time and when the PC boots the fans stop working.
I am really new to this and I am really confused.