XPS 8940 running Windows 10 Pro and Windows 11 Pro on separate internal drives.

Been running this setup for years without any issues and, when changing between operating systems, I would normally bring up the boot menu (F12) and choose which drive to boot from. However, all of a sudden, when I choose the second drive, instead of booting from that drive it goes to some random BIOS setting.

Just to clarify; say I'm running Windows 10 and want to change to Windows 11, I go to the boot menu and select the Windows 11 drive but I am getting some random BIOS setting instead.

I can still go into BIOS and change the boot order to achieve the changeover but It's more convenient to use the F12 boot menu. Plus, there is obviously something amiss which needs fixing.

I tried downloading and applying the latest available BIOS update but that made no difference.

It's a weird one and I am at a loss. Any advice would be gratefully received.

Desktops

Dell Support Resources

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