Windows 10 has a Fast Startup option that can make it hard to access the BIOS on boot up. And yes, if you don't have a UEFI BIOS or installed in legacy mode, that boot o UEFI settings option will be MIA. My posts are bit out of sync, didn't read the all the posts in the tread before posting.
thanks for the correction, mixing that up with safeboot or something like that ,,,,getting rusty ,spending to much time on that Pi,Windows 10 has a Fast Startup option that can make it hard to access the BIOS on boot up. And yes, if you don't have a UEFI BIOS or installed in legacy mode, that boot o UEFI settings option will be MIA. My posts are bit out of sync, didn't read the all the posts in the tread before posting.
Lots and lots of people hear "Fast Startup" and immediately think BIOS. It might even be called that in some BIOS. In mine its Fast Boot or Fast Bootup, I'd have to go look to confirm. I always leave it on, its never been an issue for me. If you turn it off, you get all kinds of on screen status messages etc that really slow the Boot process down. I have SSD's in my laptop and desktop so the Windows Fast Startup doesn't really give me any benefit. I do a powercfg -h off anyway to kill sleep mode and hibernate and delete the hyperfill.sys file. I never use sleep or hibernate. It also kills Windows Fast Startup. Then I go in and tweak my power settings. One of the gotchas with Fast Startup is your PC never fully shuts down, it goes in a hybrid sleep mode. That's why BIOS access is so hard on boot up. Your not really booting up, your coming out of a sleep mode.
It is called "Fast Boot". On my desktop with an SSD it adds approx 1/4 second to boot time. It is disabled because I usually need to enter the BIOS at least once a day (device is heavily overclocked and used for hardware testing and benching). All other machines it is enabled. If I need access to BIOS on them I can use the shift+power for UEFI access through windows
The BIOS "Fast Boot" option, for me, has no effect on whether I can access my BIOS or not. I can get in with it turned on of off. I never turn it off. Turning on Windows Fast Startup on the other hand makes it impossible for me to enter the BIOS on boot up by pressing a keyboard key.
I'm not sure if this problem has already been solved, but I decided to enable Fast Boot once to see how it went, and apparently it disables USB devices during the POST so I couldn't access the BIOS. I had to reset the CMOS (you can either do this by the jumper or removing the CMOS battery) and it reset my BIOS to default settings which has the Fast Boot option set to Disabled. Although this may vary by BIOS, when my computer started after I reset the CMOS, it gave me a pop-up asking me if I wanted to enter the BIOS, so if my default BIOS settings had Fast Boot enabled, that could be a way to access the BIOS for me.
I can press Esc key on my laptop or F8 on my desktop and access my BIOS Quick Boot menu. That menu will let me boot from a USB thumb drive for that one boot. Even with the BIOS Fast Boot option enabled. The laptop is UEFI the desktop legacy BIOS.
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