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I’m using a Gigabyte GeForce RTX 3070 and an Asus TUF B550 plus mother oars

I’m having trouble figuring this issue out. The vga light is on and I’m getting no display I’ve tried 2 different GPUs and reseated them in both slots multiple times with no change and I’m out of ideas

I tried with my Playstation and that worked fine

I tried HDMI

So as far as I can tell everything seems fine all fans are working when I turn the pc on and everything is lighting up but I have no display at all on my monitor

Where the overhanging bit is on the cable the slot for my GPU is square is the rounded one universal bit that will fit and be safe in both square and rounded?

That does look like the one I have in pretty sure is I notice on the detached bit one of the rounded pins has a overhanging but is that there to help? Because I'm pretty sure that slow on the graphics card is squared

The only thing it says on it is VGA G1-B

So I'm new to the pc building scene and I have no idea what to do the 6 pin connector fits in fine for my graphics card but the 8 pin doesn't what I do? I'm using the Asus Strix GTX 1080 and EVGA NEX650G