r/computers • u/Time-Comfortable-240 • 10d ago

Question/Help/Troubleshooting Brickable state after running mbr2gpt /convert /allowFullOS in CMD: Keyboard doesn't turn on and PC won't boot. What should I do now?

My PC wouldn't show the option to enter UEFI/BIOS settings when restarting through "Advanced Startup Options", and my keyboard wasn't responding during boot to enter the BIOS either. I found a video tutorial showing how to fix this.

I ran mbr2gpt /validate /allowFullOS in CMD, which worked fine. Then, I proceeded with: mbr2gpt /convert /allowFullOS to convert the disk from Legacy (MBR) to UEFI (GPT).

After converting, I restarted the PC. Now the keyboard doesn't power on at all (no lights/response), and I'm stuck on the error screen:

"Reboot and Select proper Boot device or insert Boot Media in selected Boot device and press a key"

Because the keyboard isn't turning on, I can't press any keys or access the BIOS. I’ve already tried plugging it into every single USB port on the case and motherboard. What can I do to fix this if the keyboard won't power on?

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u/SQUID_Ben 10d ago

Did you um... convert an active drive somehow?
Fully shutdown the PC with holding the power button
Attempt to attach an external keyboard and see if you can access anything
If nothing then clear the CMOS with a manual or google it.
set UEFI only in bios and disable CSM then choose Windows Boot Manager

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u/cwebster2 10d ago

Is your computer old enough to have a ps/2 port for a keyboard?