reboot and select proper boot device
Moderate
Microsoft · Windows
The BIOS/UEFI could not find a bootable operating system on any connected storage device — the system does not know where to load Windows from
Quick Answer
Error code Reboot and Select Proper Boot Device on your Microsoft Windows means: The BIOS/UEFI could not find a bootable operating system on any connected storage device — the system does not know where to load Windows from. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Enter BIOS/UEFI (press DEL, F2, or F12 during boot) and check if your boot drive (SSD/HDD) appears in the storage/SATA device list
2
If the drive is detected, go to the Boot Priority section and move your Windows drive to the first position
3
If the drive is NOT detected: power off, open the case, and reseat the SATA data and power cables (or reseat the NVMe drive in its M.2 slot)
4
Ensure BIOS is set to the correct boot mode: if Windows was installed in UEFI mode, set boot mode to UEFI (not Legacy/CSM). Check under Boot > Boot Mode or CSM settings
5
If the drive is detected but won't boot, boot from a Windows installation USB, select 'Repair your computer' > Troubleshoot > Command Prompt, and run: bootrec /fixmbr then bootrec /fixboot then bootrec /rebuildbcd
6
For UEFI systems, instead of bootrec use: bcdboot C:\Windows /s S: /f UEFI (where S: is the EFI partition)
7
If none of the above works, the boot drive may have failed — test it in another computer or check SMART status
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Replacement SATA cable
Windows installation USB for boot repair
Replacement SSD/HDD if drive has failed
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