External graphics card problem. Help

  Night Shadow 22:22 21 Aug 2018

So I bought a gtx 750 and an external pcie dock. When they arrived I connected the doc's HDMI cable to where my wlan card was and connected all cables that came with the gpu and the dock to 460w psu I connected the 6 pin connector (it had only 5 pins but space for 6 and on the other end were 2 long 4 pin connector but with 3 pins each) with the GPU and psu then connected the 8 pin cable which had 20 pin on the other end, to the dock and put the gpu on the dock. Turned on the psu and my laptop and no fans were spinning on the psu and GPU as expected.placed the drivers disk that came with the GPU and it said it couldn't find it. Than went on nvidia's website but still the same.tried going on device manager and pressed show hidden devices but still no luck. Everything is plugged in correctly when I checked 3 times. The only time when the fan on the psu started spinning was when I disconnected on of the 4 pin connectors that connected to the GPU but it started smoking from the cable. Any help I have 3 more days to see if it works before I refund it. My laptop is toshiba satellite c55-a-1nk it has Intel he 4600 integrated and gtx 710m (in the bios I didn't have option to remove any gpus or change the order) Pls help.

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