Help with b570 not posting

NotNice · ‎05-05-2026

Hi i have a b450ma-2 mobo with r5 5600g and a fresh sparkle guardian oc b570, every time i try to boot with hdmi in it it just doesnt want to post. I tried everything, from reseating, cmos reset, bios update nothing seems to work. Please help

MUC · ‎05-05-2026

I would recommend using DisplayPort if your monitor also has this option. Experience has shown that compatibility is better.

If you only have the HDMI option, please remove the Arc B570 card from the system, connect the monitor to the motherboard's HDMI port, and explicitly change the Primary Video Device in the BIOS to IGFX Video. This way, you can configure the BIOS via the motherboard's HDMI port even after reinstalling the graphics card.

After reinstalling the graphics card, please check if these options are displayed in the BIOS and change them to the following settings if necessary:

Advanced Tab > PCI Subsystem Settings:

Above 4G Decoding: Enabled
Re-Size BAR Support: Auto/Enabled

Boot Tab:

CSM (Compatibility Support Module): Disabled

Once everything is working, you can change the Primary Video Device back to PCIE Video to hopefully be able to see the Power-On Self-Test (POST) via HDMI from the Arc B570 in the future.