[SOLVED] Blank screen after switch to UEFI boot (solved)

[Klownnn]

Hi everyone,
When I first setup this PC, I cloned my previous SSD to the new one and I remember I had to change boot option from UEFI to Legacy.
I want to do a clean install of W10 to then upgrade it to W11.
Not careful enough, I changed my boot from CSM to UEFI, using MSI Bios, thinking I'll then use the USB bootable W10 setup. My mothercard is a B660M.
The reboot didn't go well : blank screen and 0 access to BIOS, trying Delete (the usual one), F5, F8, F11 etc.

I have tried :

• remove CMOS battery during 10 minutes
• use a metal piece on motherboard PIN for reset BIOS
• remove graphic card
• use HDMI motherboard port
• use Displayport motherboard port

As I understand from the first setup and now, my boot is MBR and not GPT.
Maybe the switch to UEFI also activated secrute boot and so the problem is also there ?

I have no idea how to fix it.

Thanks a lot !

 

[Klownnn]

By the way, I noticed that after removing CMOS battery, the first "boot" is like 5 seconds and... without doing anything, it turns off and boot again.

 

[Klownnn]

OK I found the solution. Remove and plug back the GPU after 20 minutes without the CMOS battery worked I don't know how to put the thread to Solved!