Screen not turning on in GRUB or after booting Ubuntu, fine in Windows 11

[vanhalenar]

Hi,

when I turn on my pc, I used to get the GRUB menu for selecting the operating system (I am running dualboot Ubuntu/Windows). Now I get a black screen. GRUB works fine, if I blindly press the down arrow key twice and hit enter, after a moment, the screen turns on and Windows is booted. However, if I boot Ubuntu, I get nothing. And it's not like the screen is turned on but black, it's just off. Any ideas on how to fix this?
I appreciate any help anyone can provide.

[oldfred]

Does down once work for older kernel?

What brand/model system?
What video card/chip?

Please copy & paste the pastebin link to the BootInfo summary report ( do not post report), do not run the auto fix till reviewed. Use often updated ppa version with your USB installer or any working install over somewhat older ISO.
https://help.ubuntu.com/community/Boot-Repair &
https://sourceforge.net/p/boot-repair/home/Home/