System boots to BIOS or hangs on BOOT debug LED
Core hardware initializes successfully, but the motherboard firmware cannot locate an active operating system boot loader.
Internal desktop parts run on harmless 12V DC voltage and cannot shock you. Simply unplug the wall power cable first, then touch the unpainted metal case frame to ground static electricity.
Common Symptoms & Tells
- Motherboard BOOT LED stays green/yellow
- PC boots straight into setup screen on every power up
- Message: 'Reboot and Select proper Boot device'
Interactive Fix Checklist
0 of 5 steps completedSafety power-off and discharge
Shut down the PC, turn off the power supply rocker switch (O), and unplug the AC power cord from the wall outlet. Press the front power button once while unplugged to discharge residual capacitor energy before touching any internal components.
Toggle CSM / UEFI boot mode in BIOS
If Windows was installed in legacy MBR mode, enabling UEFI only will hide the drive. In Settings, test toggling CSM (Compatibility Support Module) On or Off.
Verify NVMe/SATA drive detection in BIOS
Check the NVMe Configuration or Storage Information tab in . If the is not listed, reseat the M.2 or replace the SATA data cable.
Adjust Boot Priority list
Set 'Windows Boot Manager' on your primary OS drive as Boot Option #1 rather than generic drive names or USB storage devices.
Repair EFI bootloader with Windows installation media
Boot from a Windows USB installer, select Repair Your Computer → Command Prompt, and run 'bootrec /fixboot' and 'bcdboot C:\Windows /s S: /f UEFI'.
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