u/CauliflowerSoggy3037

I’m trying to enable Secure Boot, but the BIOS requires me to disable CSM first. The problem is that after disabling CSM, my PC no longer detects any monitor — I get no display output at all, not even in BIOS.

My system drive is already using GPT, so it’s probably not an MBR issue.

Does anyone know what could be causing this? Maybe something related to the GPU, UEFI settings, or monitor cable/port?

I need to enable secure boot to play Valorant

Motherboard: AsRock B450M-HDV R4.0