Stuck in UEFI after reset to default.

NavyLCDR said:

RUFUS, as shown in post #24

Well I had done it with Unetbootin and worked fine. But when I got into Partition Wizard I got the same warning as before.

Arc said:

You are using Partition Wizard as installed in the PC.

YOU NEED TO USE THE BOOTABLE CD.

Boot from PW Boot CD.

• How to make a PW Bootable USB without professional edition.
  
• How to boot from PW Bootable CD/USB.
• How to Convert MBR disk to GPT using PW.

Dont forget to have your windows installer ready before doing it.

Have you actually done this yourself and tried to convert the hard drive that contains the system the computer boots from?

kmint said:

Well I had done it with Unetbootin and worked fine. But when I got into Partition Wizard I got the same warning as before.

I built my new UEFI computer two weeks ago. The SSD from my old computer was MBR. I could not get it to convert to GPT with the operating system on it.

I tried booting from MiniTool Partition Wizard flash drive and got the same results as you. I tried creating a backup image with Macrium Reflect, then converting the disk to GPT, then restoring the backup. No luck. So I ended up converting the blank SSD to GPT, booting from Windows 10 UEFI flash drive and doing a clean install.

MiniTool Partition Wizard did convert my storage only hard drive to GPT without any data loss.

Arc said:

Many a times. Here is the first time, for myself.

Glad you got it to work. Wouldn't work for me. What step was I doing wrong? Bios set for UEFI booting. Initially tried to boot from flash drive created from MiniTool Partition Wizard Free ISO. It would boot up to the point just before loading MiniTool but then freeze, I think incompatible graphics card - but that flash drive would boot on my other computers all the way into MiniTool. Booted from Kyhi's Recovery PE flash drive which contains MiniTool Partition Wizard Pro. Attempted to convert SSD to GPT and got the same results as kmint.

Windows 10 Recovery Tools - Bootable Rescue Disk - Windows 10 Forums

Arc said:

First time:
It was Legacy BIOS setup disabling UEFI. Disks was MBR, containing Logical partitions too.
PW bootable USB was made with UUI. Booted from it, Selected the disks one by one, converted them to GPT, applied.
Set the BIOS to UEFI, booted the windows installer as UEFI (using boot menu), installed Windows. It automatically created the MSR partition, and I was sure that it is done.

Later times (at least 10-12 times for friends and colleagues. They got new boards but kept old HDDs):
BIOS set to UEFI by default (new boards). UEFI Bootable PW created with Rufus. Converted the disks to GPT. Ran windows installer as UEFI. All set.

Why were you running the Windows installer after converting the disk to GPT?

Arc said:

To have a clean install in UEFI mode. :) After the disks are changed to GPT, the installed windows is of no work there.

Well...that happens to be what kmint is trying to do in this thread. Convert an MBR disk with an operating Windows 10 installed on it to GPT for use on an UEFI system. So you haven't previously done what we are attempting to do in this thread. What you have done is converted disks to GPT and THEN installed Windows 10 on them after the conversion.