Question No output from graphics card in new motherboard

Oct 9, 2020
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Hello all. First of all excuse me if I explain things badly, I will do my best though.

A friend gave me his old motherboard, a Gigabyte GA-Z77X-UD3H, with Intel i7-2600k 3.40 GHz. He also gave me an SSD where I installed a fresh Windows 10 64bits. That's where the problems began. It wasn't letting me install Windows 10 because of disk type or something like that (I was using an USB to do that), but I managed to pull through by changing some options about Legacy and stuff. So far, so good-ish.

But here came the biggest problem. My Radeon R7 250x is not giving any output on my monitor (conected by VGA because my monitor doesn't support HDMI, but the Radeon does). I can enter the BIOS and Windows only if I have my monitor plugged to the motherboard and not my graphics card.

In Windows, my Radeon doesn't show in the device manager, only the integrated graphics.

I already tried other sockets for the graphics card, but same result. I tried many options in the BIOS, regarding UEFI, Legacy stuff but I'm not quite sure what I'm doing there, so I hope you can help me regarding that. I'm sure it has something to do with BIOS configuration but I cannot seem to land in the exact configuration my graphics card needs to function properly.

Please, can you help me? I will make sure to answer all your questions and try all the possible solutions available to me. My Radeon worked perfectly in my other motherboard, and even though my friend had this motherboard laying around for some time, he used it with a graphics card too.

Thank you.

OS: Windows 10 64bits
Motherboard: Gigabyte GA-Z77X-UD3H
Processor: Intel i7-2600k 3.40 GHz
Graphics card: Radeon R7 250x
RAM: 12gb

EDIT:
I also resetted the BIOS a couple of times, but same results. I'm hitting brick walls in every turn!
 
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