It seems like you're facing an issue accessing the BIOS on your Gigabyte motherboard with an AMD Ryzen 5 4600G processor. To resolve this, try connecting your monitor using a different video output, such as DisplayPort or DVI, instead of HDMI. Additionally, ensure that your BIOS is up to date by visiting the Gigabyte website and checking for any available BIOS updates for your specific motherboard model. If the issue persists, contacting Gigabyte support directly may provide further assistance tailored to your specific hardware configuration.