Win10 : black screen & cursor after converting MBR TO GPT

Plankton said:

Off topic here: Yesme, have you thought of doing a multi boot vs a dual boot. The difference is; there's a OS on individual drivers vs 2 OS's on the same drive. When I ran multiple OS, multi boot was my preferred method. Less chance of MBR/GPT corruption.

It's laptop and I don't have slot for another drive, using external usb disk drive is inconvenient in my case.

Plankton said:

I never ran a dual boot on a laptop for the very reason you're experiencing. Too much to go wrong and being forced to do a clean install or factory reset.

you right. Anyway, I'll remove the windows files and keep only my personal files and user_data for Chrome in that partition then I'll create a new partition to install windows. Most of my apps are portable.

AddRAM said:

Hold up on to that for a bit, I`ll ask someone to join the thread.

This should be an easy fix.

But like Plankton, I don`t do multi OS`s on 1 drive.

thanks, I'll wait.

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AddRAM said:

I think if you install the free version of EasyBCD on your Linux system you can fix it.

EasyBCD - NeoSmart Technologies

I have PE windows on my usb that has lots of tools and EasyBCD is among them. EasyBCD is for MBR, there is another one called BootIce and it can edit entries, however it didn't fix it. I think that's the problem is not EFI, maybe registry get corrupted. I use to solve this kind of problem by coping files from RegBack, but The system registry is no longer backed up to the RegBack in new versions of windows. I was pressing random keys on my keyboard and a window showed up for a short amount of time.

If you have Macrium Reflect on your Windows PE USB flash drive, run that and from the restore menu use the utility to Fix Windows boot problems. Also, you can get rid of the "old MBR" system reserved partition, it is of no use because you can't boot in legacy BIOS (or CSM) mode from a GPT disk. You can also create a Macrium Reflect rescue drive from any computer with Macrium Reflect installed and use that to boot the problem computer from.

Geneo said:

CSM not CDM. CSM is the legacy boot mode. Disabling boots in EFI. But there must be something something more wrong. Your EFI partition should let you boot in Legacy MBR mode. I think the Windows Boot Manager must be fubar and maybe not finding the EFI partition.

The EFI partition will not let you boot in Legacy MBR mode. In order to boot in Legacy MBR mode, there must be an MBR disk to boot from. Both of @yesme disks are GPT. You can only boot from a GPT disk in UEFI mode.

NavyLCDR said:

If you have Macrium Reflect on your Windows PE USB flash drive, run that and from the restore menu use the utility to Fix Windows boot problems. Also, you can get rid of the "old MBR" system reserved partition, it is of no use because you can't boot in legacy BIOS (or CSM) mode from a GPT disk. You can also create a Macrium Reflect rescue drive from any computer with Macrium Reflect installed and use that to boot the problem computer from.

Yes I have this tool on my windows PE, I ran it but it didn't fix the problem, still a black screen and a cursor that I can move it.

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Geneo said:

CSM not CDM. CSM is the legacy boot mode. Disabling boots in EFI. But there must be something something more wrong. Your EFI partition should let you boot in Legacy MBR mode. I think the Windows Boot Manager must be fubar and maybe not finding the EFI partition. dumping the BCD might help diasgnose, or as suggested, repair it.

Code:

Windows Boot Manager
--------------------
identifier              {9dea862c-5cdd-4e70-acc1-f32b344d4795}
device                  partition=J:
path                    \EFI\Microsoft\Boot\bootmgfw.efi
description             Windows Boot Manager
locale                  en-us
inherit                 {7ea2e1ac-2e61-4728-aaa3-896d9d0a9f0e}
default                 {4bc4566c-31ee-11eb-b2a4-9c381b7970cd}
resumeobject            {4bc4566b-31ee-11eb-b2a4-9c381b7970cd}
displayorder            {4bc4566c-31ee-11eb-b2a4-9c381b7970cd}
toolsdisplayorder       {b2721d73-1db4-4c62-bf78-c548a880142d}
timeout                 30

Windows Boot Loader
-------------------
identifier              {4bc4566c-31ee-11eb-b2a4-9c381b7970cd}
device                  partition=E:
path                    \Windows\system32\winload.efi
description             Windows 10
locale                  en-us
inherit                 {6efb52bf-1766-41db-a6b3-0ee5eff72bd7}
isolatedcontext         Yes
allowedinmemorysettings 0x15000075
osdevice                partition=E:
systemroot              \Windows
resumeobject            {4bc4566b-31ee-11eb-b2a4-9c381b7970cd}
nx                      OptIn
bootmenupolicy          Standard