Will my new gigabyte AB350 gaming 3 be compatible with this video card

Nov 19, 2018
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Hi all,
I just got the ryzen 2700x with ab350 combo. I planned to use an old graphic card:
HP NVIDIA GTX 970 Aries-E2 FH4GBGDDR5 803185-001 4GB 256-Bit GDDR5 PCIe Express x16 3.0 Video Graphics Card
but it seems the vga led on the motherboard is always lit as an error.
I read that the ATX_12V connector has to be connected(which I haven't due to my old PSU), but if I were able to do so, will this graphic card work?
Graphic card:
https://www.newegg.com/Product/Product.aspx?Item=9SIAGSC7M21310
Motherboard:
https://www.gigabyte.com/us/Motherboard/GA-AB350-Gaming-3-rev-1x#sp