When you boot and look at the selection for endeavour OS do you have an option with lts kernel? Before you arrive at black screen.
I see that you run newest kernel 5.15, but have you also installed lts as backup and tried booting into your system using lts kernel?
Well give us the terminal output for the inxi -Fxxxz for the graphics part. To see if that worked or the card is using any other driver stillā¦
Which commands have you used, which packages have you uninstalled?
We are looking a bit at a crystal ballā¦ Not easy to help, very little info provided starting from your first post. Be more specific for successful troubleshoot and patient.
Perhaps it may be a good option from a clean slate and for him to install only install nouveau and also tick the lts kernel and header options at install to test both.
Then first try via nvidia-installer-dkms, and if it doesnāt work test Nvidia 495 install according to my post linked above. Then if it doesnāt work remove these packages and try with 370xx on AUR. I do not know everything that has been tried or done to that system and looks like some other stuff could have been broken.
What can I do with the installed backup
If you can get to a TTY, you can install the LTS kernel even if it isnāt installed.
Once you install it, it will become an option in the boot menu.
yeah Iām in a tty right now copying files to a usb for a potential reinstallation.
Also: this should only have been significant in terms of what Iāve already tried with the graphics cards, but I was running a mining rig with ethereum classic on t-rex that Iād recently set up on the pc.
I think the kernel may already be installed, so what would be the potential benefit if I were to install/reinstall it?
If you are in a TTY, you should just be able to try:
sudo pacman -Syu linux-lts linux-lts-headers
If the āLTSā kernel is already installed, there is no benefit in reinstalling. You can just reboot into it.
You can check with:
pacman -Qs linux-lts
and how would I āreboot into itā
Iāve tried every option in the boot menu
It would be an option on the grub boot menu when your machine first boots.
Itās worth a try before reinstall.
Aha time is 
there are three options: the first one, which has provided the described result, the second one(initramfs) which has provided the same result as the first, and the third, which takes me to a menu that has been the same since I had windows installed on the computer that is built in to the computer seemingly beyond GRUB
Yeah Iāll try that as soon as the information is done copying to the usb, since Iād just like to have that done. It takes quite a while.
In that case, you probably donāt have the LTS kernel installed. Only the mainline kernel.
card is supported by latest Nvidia Driver, the issue could be that DRM Modesetting is not enabled.
that can be done in the most easy and save way by adding the option into grub kernel line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet loglevel=3 nowatchdog nvidia-drm.modeset=1"
and regenerate grub.cfg:
sudo grub-mkconfig -o /boot/grub/grub.cfg
what should enable optimus support from Nvidia driver and boot on intel GPU if no switcher is enabled/configured
I ran both of the commands and got the same result after trying reboot in a few different options on grub menu. Was the first command only supposed to be entered verbatim into a terminal command, should it have been added as a line in a certain file somewhere, or something else?
If it should go in /boot/grub/grub.cfg, where in the file should it go? The file is quite long.
by that means edit the file /etc/default/grub and add nvidia-drm.modeset=1 to the options on the line GRUB_CMDLINE_LINUX_DEFAULT="quiet loglevel=3 nowatchdog"
so that it reads like so:
GRUB_CMDLINE_LINUX_DEFAULT="quiet loglevel=3 nowatchdog nvidia-drm.modeset=1"
save the file and run the grub command:
sudo grub-mkconfig -o /boot/grub/grub.cfg
same result, a blinking white line in the upper left hand corner with the text above it:
āStarting version 249.6-3-arch
/dev/nvme0n1p2: clean 378181/15597568 files, 13983644/62381347 blocksā
and when I pres ctrl+alt+f2:
āEndeavourOS Linux 5.10.79-1-lts (tty2)
System login:ā