PC not booting after enabling Secure Boot – screen only shows color cycling

Dina Osmanagic · 14. Mai 2025

Hi everyone,I have a serious issue with my CSL all-in-one PC running Windows 11.I went into the UEFI firmware settings via advanced startup options to enable Secure Boot. After restarting, the system no longer boots.Here’s what happens when I turn it on:The screen just shows color cycles red, green, blue, white, etc.I can’t get into the BIOS/UEFI — pressing Del, F2, ESC, etc. does nothingI already removed and reinserted the CMOS battery — no changeI tried using a wired keyboard Logitech K200 but still can’t get a responseIt seems like the system is stuck before even reaching POST, possibly

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PC not booting after enabling Secure Boot – screen only shows color cycling

PC not booting after enabling Secure Boot – screen only shows color cycling

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