Can't access bios or advanced startup on windows 11

I had the same problem but was able to fix it.

Step 1, Change the monitor refresh rate to 60Hz.

Step 2, Turn off the fast start-up in the power option (google for instructions)

Step 3, Use HDMI or DP to connect to the motherboard, not the GPU(I used DP)

Step 4, I had my PS5 turned on and connected to the HDMI port of the monitor(IDK PS5 help or not, maybe you can just turn off the monitor). When I reset the PC, the monitor switched to HDMI. While the PC was resetting, I smashed F2 and DEL. I switched back to DP after 10 or 15 seconds and voila, it worked!!!

I encountered the same issue and managed to access the BIOS by plugging my HDMI into a TV rather than a monitor. Since this isn't a practical long-term solution, I did a bit more digging.

I noticed that disabling Secure Boot and enabling CSM support in the BIOS settings fixed the issue for the monitor, but I wanted Secure Boot enabled for Windows 11. Eventually I found that switching my PCIe setting in the BIOS from Auto to 3.0 allowed me to see the BIOS and motherboard logo even with Secure Boot enabled.

For me, the actual cause of this issue was disabling CSM to turn on Secure Boot rather than anything with Windows 11 itself—though I think a lot of people do this step while upgrading. Luckily I was able to work around this by changing the PCIe setting.

Hope this is able to help others.

I found my solution so it's probably not the same for everyone, I needed to clean my computer so I blew it out with compressed air, when I got it hooked back up is when the problems started, to make a long story short, I connected my HDMI monitor cable to the motherboard and not the graphics card. I realized my mistake and re-connected to the video card and now I can access the BIOS. Maybe this solution can help someone.

PROBLEM SOLVED

Hi guys!

Long short story. I finally bought my own machine, which, because I am a geek, I assembled myself. OC is not an obstacle for me, so after the entire installation and after several unsuccessful attempts to enter the BIOS, I started to wonder why I spent so much money on equipment that I cannot configure myself.

However, after a long and tedious reading of all your posts regarding refreshing, fast boot, etc., I found the reason!

Well, in my case, having an Nvidia card and a Samsung monitor with 240 Hz refresh rate, it helped... changing the version of the DisplayPort connector! In order for me to use G-Sync, I must have the connector set to class 1.4. Changing to class 1.2 solves the problem!

However, what surprises me is that I tried to connect my different monitors using various methods, but it didn't work every time. Resetting the CMOS when removing the battery from the motherboard helped temporarily.

To sum up, thanks for the guidance and I hope my solution can be useful to someone!

Interesting because I just posted going from 2.0 to 1.4 and it worked. Therefore it doesn't seem to be dependent on DP version, but rather just a change? I also have Nvidia G Sync fwiw

I've been having same issues ever since changing form 32gb DDR5 (GSkill) to 96gb DDR5 (Corsair w/micron). When I change my monitor DP input to 1.4 (from 2.0), I get BIOS Everytime. If I go back to DP 2.0, it boots straight into Win11P.

So anytime I need BIOS, I just switch to DP 1.4. However, this can't be normal, and since it started with my new RAM, I'm left to assume it's doing something weird. Hope this helps others.