Question BIOS won’t start; activated secure boot for update

[Will Mungas]

I have a Gigabyte B360M motherboard.
Windows 10 was installed on a 240 gig SSD; I wanted to upgrade to 11, and a system check told me I needed to activate a setting in BIOS called secure boot. I went into BIOS and disabled CMS, but secure boot would not start unless I used a default User platform key. I used the default PK. After activating this and restarting the computer would not boot at all, even to BIOS.

I discovered the issue was that UEFI and Secure Boot would not work without a primary partition formatted as GPT. I fixed this by disconnecting all drives, booting (BIOS worked again) and then converting my SSD with Windows from MBR to GPT using mbr2gpt on the command prompt. After going to BIOS again I was able to set up Secure Boot as before, but now the computer will not boot and I have tried with and without any drives installed, and even removed and reinstalled the CMOS battery.

This is absurd and I don’t really know what to do at this point. Unless I’m wrong the problem should be that I possibly didn’t use a UEFI setting, which is apparently required for GPT. Any help appreciated. All other components, except TPM were good for the upgrade. I’m really struggling with this.

 

[Lutfij]

Welcome to the forums, newcomer!

Gigabyte have a number of B365M motherboard's, which one do you have? Can you check and see what BIOS version you're on at the time of writing? Also, if I were you, I'd have reinstalled the OS(Windows 10), as opposed to converting the partition from MBR to GPT.

 

[Whiskey969]

Did anything work? Because I am dealing with a similar problem here:

I wanted to get win 11 so I ran the pc health check and followed steps to enable tpm 2.0. I did that and got an update for win 11 without enabling secure boot. However, when I tried playing valorant I got an error that said the secure boot was needed so I looked up how to enable that.
My mobo is gigabyte b550m aorus elite. I went to the BIOS and disabled CSM and exited and rebooted my pc. Then again to the bios and enabled secure boot. This is where it goes bad. My system seemed like it booted but I had no display. I did everything from changing displays to cables, nothing worked. I have Ryzen 5 3600 which requires a dedicated GPU if I am not wrong. Lastly, I removed the CMOS and reset the bios. I reverted back to Windows 10 and followed the same procedure, but again the same results. And by drives are already GPT and Windows shows bios as UEFI. GPU is 1660 super.
What am I missing? Please help.

 

[Ripedoggyy]

I have the same problem. I have brought my pc to a computer specialist. All the device plugged to my pc seem to be disabled (the keyboard lights blinks, the fans stops spinning and the GPU isn't showing any video signal). Maybe try getting an external GPU via usb 3.0 or usb-c...

For now the computer specialist still tries to repair my computer so if he manages to repair my pc I will update my post 😉

 

[GhostP]

Did anything work? Because I am dealing with a similar problem here:

Think it probably has to do with setting the key up properly in the BIOS once you enable secure boot, unless this is truly a Gigabyte issue. This Microsoft link may help: https://www.windowscentral.com/how-enable-secure-boot-pc-install-windows-11

 

[Ripedoggyy]

Unfortunately, the pc specialist didn't manage to fix my problem but he told me that to be able to boot in bios, you have to have integrated graphics.
So my solution is to buy a cheap celeron g5905 at 40 bucks, put it in my system so you can boot into the bios, enable CSM and disable secure boot, then put back the gpu and the cpu.