Question Motherboard doesnt find GPU

Jul 17, 2019
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Hi I have an issue with my gpu or motherboard.
I have a:
Asrock h81m-vg4
Intel g3260
Evga geforce 550 ti
Samsung 256gb ssd
2 X 1tb hdd Seagate
Corsair cx600m psu
8gb ram

My pc doesnt recognise my 550 ti it just wont find it. I borrowed a 660 ti to check if it was my mobo that worked 100% fine. I tried my 550 ti in another pc and it worked fine. Nvidia driver wont load because it doesnt find hardware. I'm new to this I've always bought pre built so never had to add parts myself ect. What do I do from here?