EDIT try this first:
Wait, are you still getting an “Operating system not found” like error or just a totally black screen? If totally black screen, maybe it is just the graphical environment that isn’t working? When you get to the black screen, give it a minute or so, then hold alt (or ctrl+alt at the same time, try it both ways) while tapping F1-F12 keys one by one and see if you get a TTY login prompt? You may also have to hold an Fn button on the keyboard to change the F1-F12 keys from media-mode to function-mode depending on your BIOS settings. If you do get the prompt, login with your user (nothing will change on screen while you type the password, which can be confusing if you are expecting to see asterisks or something, apologies if you know this but I don’t know what Linux experience you have) and then try the commands xinit
or startx
and you will likely get the opportunity to see an error that is occurring?
EDIT, the following was assuming “Operating system not found” like error:
Hmm… this is weird. I would say try changing the boot mode between UEFI vs legacy BIOS, but I see that you already have…
If possible, can you boot to live Linux USB and use the fdisk/gparted tool to inspect the partitions? If you can post a pic/screenshot of the partition info that might give us some more info.
What steps did you take to manually parition? Is the boot partition formatted with an EXT4 file system?
Updating your BIOS is probably going to be a pain without a Windows system to do it from, because you are at the mercy of laptop manufacturers here, unless it supports updating from a USB
If you are considering a totally different OS (I think this is worth a shot, at least for sanity), I’d recommend trying a Fedora 41 install. EDIT: It looks like Nobara is a better candidate to try instead of plain Fedora, because it comes with proprietary NVIDIA driver, which may help your issue if it is a problem in the graphical environment.
I believe you could use qemu for 64-bit emulation on a 32-bit system