In preparation for an upgrade to Windows 11, I have converted my Windows 10 boot drive (M.2 MVMe SSD) from MBR to GPT, using the mbr2gpt.exe Windows tool. I then tried to reboot into BIOS (B450 Aorus Elite, Ryzen 7 2700X), to switch to UEFI boot mode, but I cannot get to the BIOS as the machine keeps booting straight back into Windows. Disk Mgt shows that the boot drive is now GPT, but the next time I try a cold reboot it will fail, as I am unable to set UEFI mode in the BIOS.
In my Windows power settings I have fast startup disabled. I have tried doing Shift-Restart then selecting Advanced Settings...UEFI firmware settings. When I do this the machine begins to restart, I hear a beep but then nothing happens (I have waited up to 20 minutes). Both displays remain blank. If I then press the reset button it reboots straight back into Windows (I don't see the motherboard splash screen).
I have tried connecting one of my two displays to the on-board HDMI port (I have a ZOTAC GeForce GTX 1660 SUPER 6GB Twin Fan Graphics Card), but it didn't help.
If I press the reset button, then continually hit the DEL key while the machine restarts, the machine never starts - both displays stay blank throughout. I don't see the motherboard splash screen. I'm using a wired USB keyboard, connected to the front USB port.
I tried removing the CMOS battery, waiting 15 minutes, then replacing it. It didn't help - the machine still boots straight back into Windows (or fails to boot into anything if I press the DEL key during the restart).
Any ideas?? I'm running Windows 10 Pro 22H2. The CMOS reset jumper is really difficult to access, as it's buried under a load of cables. Removing the SSD would also be a pain, as it's blocked by the graphics card, so I'd need to remove the graphics card first.
In my Windows power settings I have fast startup disabled. I have tried doing Shift-Restart then selecting Advanced Settings...UEFI firmware settings. When I do this the machine begins to restart, I hear a beep but then nothing happens (I have waited up to 20 minutes). Both displays remain blank. If I then press the reset button it reboots straight back into Windows (I don't see the motherboard splash screen).
I have tried connecting one of my two displays to the on-board HDMI port (I have a ZOTAC GeForce GTX 1660 SUPER 6GB Twin Fan Graphics Card), but it didn't help.
If I press the reset button, then continually hit the DEL key while the machine restarts, the machine never starts - both displays stay blank throughout. I don't see the motherboard splash screen. I'm using a wired USB keyboard, connected to the front USB port.
I tried removing the CMOS battery, waiting 15 minutes, then replacing it. It didn't help - the machine still boots straight back into Windows (or fails to boot into anything if I press the DEL key during the restart).
Any ideas?? I'm running Windows 10 Pro 22H2. The CMOS reset jumper is really difficult to access, as it's buried under a load of cables. Removing the SSD would also be a pain, as it's blocked by the graphics card, so I'd need to remove the graphics card first.