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One of our users' PC is failing to boot. It gets to the Windows logo, but it stays there forever and the spinning dots do not appear. There are two drives, and the same thing happens when I boot directly to both from the BIOS.
I've tried Startup Repair using a USB installer, but that just says it failed to repair. I can't access the recovery menu from the drive, because when I press the power button, it turns off instantly and doesn't wait. The install USB detects all the drives, and I was able to restore the volumes using a third-party backup tool without errors, but that made no difference.
I tried a clean install of Windows, but it just said the existing volumes were MBR instead of GPT and refused to format them.
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If you have all your data, try to boot to Windows 10 USB boot media and delete all partitions. If it refuses to delete, you can run Command by pressing Shift + F10 and use diskpart tool to delete them. Then try to install Windows 10 again.
I tried diskpart and it said that it removed the partition, but it still showed up in the list after I clicked Refresh and I couldn't format it.
Hi there,
You can access the Admin CMD and follow the below steps to make the conversion.
-Type diskpart.
-At the DISKPART prompt, type list disk. Note the disk number you want to convert.
-At the DISKPART prompt, type select disk <disknumber>.
-At the DISKPART prompt, type clean.
Convert an MBR disk into a GPT disk https://learn.microsoft.com/en-us/windows-server/storage/disk-management/change-an-mbr-disk-into-a-gpt-disk
MBR2GPT.EXE converts a disk from the Master Boot Record (MBR) to the GUID Partition Table (GPT) partition style without modifying or deleting data on the disk. https://learn.microsoft.com/en-us/windows/deployment/mbr-to-gpt
Once it is done you can try to clean install the PC.
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