I made a mistake with my bios configuration.
I made a mistake with my bios configuration.
The system is running smoothly, but I'm attempting to turn on secure boot for a game. I navigated to BIOS, turned off CSM support, then enabled secure boot. An error appeared: “Secure Boot can be enabled when Platform is in User Mode. Repeat operation after enrolling Platform Key (PM).” I went to key management, pressed enter at the platform key that displayed and updated, then saved and exited. Now the computer won’t boot normally—it shows a black screen despite everything working before.
The black screen occurs because Windows is set up as Legacy/CSM and doesn't support UEFI booting. You need to modify the current installation to use GPT or perform a clean install with CSM turned off.