No signal on screen after activating SecureBoot.

Hello

or even to plug my screen into the motherboard by removing the graphics card

It's normal, your processor doesn't have a graphics circuit; only your graphics card manages the display.

However, I don't really see the connection between modifying the secure boot (even if that's the kind of thing you shouldn't touch) and the fact that you can't access the BIOS at all; there's something else going on.

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hi

w11 without secure boot should crash, I think!

not everyone is a genius, but we're working on it
google is your friend, don't forget that!

And you didn't do anything else?

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Ok....

So I don't know where you got that information from.... but you’ve just erased the security key that links your UEFI BIOS to your version of Windows in the secure boot.... we only tinker in there for dual-booting under Windows 11.

Disconnect all your drives (power and data cables), you should be able to access the BIOS again, then reset the secure boot settings to how they were before, and try connecting only your Windows drive again. If it works without the license being blocked, you're in luck. Otherwise, you'll have to reactivate the license online, or at worst, reinstall Windows....

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The post is dated, but I would like to share my contribution for others who have this kind of problem.

I also had the issue with secure boot that I tried to enable in order to install Win11, and I accidentally modified some values in the Key management section, and my troubles began... no display, and I couldn't access the BIOS either.

An IT technician didn't understand my problem, so I decided to sort it out myself, and in the end, I was right to do so because I managed to fix my situation even though not all of my issues are completely resolved.

My solution is to flash the BIOS and also update it. If anyone who encountered the issue hasn't resolved the problem yet and has the same motherboard as mine, it can be done outside the BIOS using the button at the back of the central unit with a USB key.

Once the new BIOS is installed, you can generally access the BIOS again. Once inside, of course, disable secure boot if it is still active.

However, this did not fix the display issue after the BIOS. I spent some time trying to find a solution and I realized it was a port problem; the computer struggles to recognize the display port, so you have to try using HDMI instead, or else the graphics card acts in the dark.

So how did I solve the problem? I found something that worked for me, which I have never seen on other forums, even English-speaking ones, so I decided to post it.

In fact, as soon as you have the option to change your screen's refresh rate (an option on the screen itself), try modifying it; for example, if you were at 144Hz, try 60Hz and vice versa.

For me, that was the issue; the display port signal started working again. I think there was a mismatch between the refresh rate of my screen and the one recorded deep inside my PC, especially after the changes made through the software.

Now, I put forward a hypothesis; more precisely, what caused the mess is the CRU (Custom Resolution Utility) software, which allows you to change your screen resolution and refresh rate with resolutions not natively supported by our GPU. I think there was an error at that level. I detected this when, as soon as I arrived on my desktop, I tried to change my resolution to a custom one, and my screen turned off again. So I would like to know if everyone struggling with this kind of issue happens to have this kind of software in common.

So, I did a reset of the resolutions in the software's folder, and now I can switch resolutions. I just avoid creating resolutions at 60Hz when my screen is at 144Hz because that is mostly what caused my display port output to bug and revealed itself with the secure boot or whatever.

To summarize:

1) Flash the BIOS via USB if possible with minimal hardware on the motherboard.

2) Try to change the refresh rate of your screen directly on the screen itself.

3) Change the port to HDMI if you are on DisplayPort for example, or try to have a processor with integrated graphics and connect the screen to the motherboard.

4) Once on the Windows desktop, ensure that a third-party software like CRU is not responsible for the issue, reset it via the .exe reset.

5) Properly uninstall your graphics card drivers using a special uninstaller for this purpose and reinstall the graphics driver afterward.

On some graphics cards, there are firmware updates that can also correct the black screen caused by the activation of secure boot, so check that as well.

I hope I have helped someone with this little-discussed element on forums, namely the refresh rate issue that bugs and defaults after secure boot or the key management change, especially if one has changed the resolutions and native frequency via third-party software.

Well, I'm stuck here... it's complicated without the PC in hand.

By any chance, do you have a computer monitor, not a TV? Check the monitor connection, try changing the HDMI or DisplayPort output, do whatever you can in that regard and also check that the graphics card is properly seated in the PCI Express slot.

Does the PC make a beep?

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In this specific case, I would rather advise you to consider another option; the original issue comes from the motherboard, which is relatively new. You should invoke the warranty and request an exchange, citing a malfunction without further explanation.

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