Windows 10: booting into UEFI BIOS

Hello, my computer always boots into UEFI BIOS instead of Windows. I tried to recovery but it always fails because I can never get it to reboot. I was wondering if I bought a Windows 10 system disk from Best Buy and reinstalled the computer by inserting the system disk, would that completely fix the problem?

:)

 

Changed to gpt and uefi bios, now windows wont boot

Emil Gyldenskog Nøsavik

Thank you for posting in the Microsoft community.

When a MBR hard disk is converted to GPT, if you can't get into the system, it's usually due to incorrect BIOS settings or no UEFI boot. Here are the steps to solve this problem:

1. Enter PE system: Use a USB flash drive to boot and enter the PE system (pre-installation environment) to make sure the data is normal.
   
2. Check the BIOS settings:
   
   • Make sure UEFI boot is set in BIOS.
     
   • If the BIOS is set to UEFI boot, but the partition is still MBR partition, you need to modify the BIOS settings to match the hard disk partition mode and boot mode.
     
3. Use a PE tool that supports UEFI: Make sure the PE tool you use supports UEFI repair boot.
   
4. Create an EFI system partition:
   
   • In PE system, open "Disk Management", find the SSD (usually labeled as "Disk 1"), right-click and select "Compress Volume" to compress about 500MB of space.
     
   • Open a command prompt, type `diskpart` and enter.
     
   • Use the `select disk` command to select the SSD.
     
   • Use the `create partition efi` command to create the EFI system partition.
     
   • Format the EFI partition using the `format fs=fat quick` command.
     
   • Use the `assign` command to assign a drive letter to the EFI partition.
     
5. Bootstrap Repair:
   
   • In a command prompt window, type `bcdboot x:\windows /s y: /f uefi`, where `x` is the drive letter where the system is located in the SSD and `y` is the drive letter of the EFI partition.
     

Hope the above information can help you



Best Wish

Shawn Z | Microsoft Community Support Specialist

 

Windows stuck in automatic repair; Can't access BIOS/ boot menu

I've changed the boot order through both BIOS and the boot manager, as my original post stated. Neither did anything, but both were functional in the past. Neither listed the windows boot manager, either. Previously, it would boot just as expected whenever
other media was set as the first option, so I'm pretty sure there are no issues there.

As my original post suggested, I've already tried out the steps you gave. I've gone through all the options listed in the boot menu, UEFI or not.

My BIOS and boot menu settings were at their defaults when all of this started, so that's been tried already, if those are what you're referring to.

 

AsRock Z77 Pro3 - AHCI? UEFI?

UEFI is a new standard of bios design, so that would probably be what the BIOS has listed as the first boot option, where ACHI is a mode that SATA controllers run, and that is probably listing drives by order of first to last by port order. Not sure why it would list that way (if my guess is right as to how/why it is listing the drives).