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If this was an onboard graphics problem or even drivers, you would be able to access BIOS connected via HDMI.
It appears to be an issue with HDMI port on the motherboard. I recommend checking with Gigabyte support for more information: GIGABYTE - Support
thank you very much for your answer. I was hoping I could avoid disassembling the whole computer but there seems to be no other option. At least I now know that there is no issue with the CPU.