Graphics card fans are not spinning

I've been building my computer outside the case today and I've discovered that when I power it up the graphics card fans don't spin. They start to but then stop immediately. The fan on the CPU spins and the power supply appears to work. I have tried to move the card to another pcie slot and it is plugged In. Any suggestions?
CPU- amd fx 8 core processor
PSU- sea sonic M12 II bronze
GPU- gigabyte amd radeon hd 7870
Mobo- asrock 970 extreme3
Memory- ballistix 8 gb DDR3 1600

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  1. Best answer
  2. Thanks for the advice but I actually managed to figure it out. I needed to plug in both power cords for the card at the same time to get it to work.
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