Converting mbr to gpt failed for Win10 laptop

It is probably quite straightforward and fixed in a few seconds by anybody who is familiar with this kind of thing.

Lost count of the number of times I have done it.

NavyLCDR said:

I just have to ask..... after you converted the disk from MBR to GPT did you change the BIOS setting to boot in UEFI mode? I don't see any indication that you actually changed the BIOS to boot in UEFI mode - only that you noticed the option was there.

Yes, I did change the BIOS settings to UEFI.

SIW2 said:

diskgenius will convert an mbr disk to gpt or vice versa. It doesnt automatically create the esp partition. After conversion rt click unallocated space and select create esp/msr. Click Save All and let it format the esp. ( The old 100mb system partition could be deleted to create the aforementioned unallocated space ). Then populate it with bcdboot command.

Sounds like a lot of steps if you havent done it before, but when you have done it once, it all makes sense. Takes about 60 seconds to do the whole job.

OK, did all that and checked the drive to ensure the ESP was populated with the correct files.

Seems to boot OK now.

Thanks for all the help.

Unfortunately, it just DIED -- I'm not kidding; Stone dead -- will not power on.

Oh well, got three years out of a free laptop -- so can't really complain.