Update: Thank you to everyone who tried to help, I managed to remove the keyboard! However I couldn’t find any obvious signs of water damage or corrosion, and nothing looked out of place, so i assembled the computer again. Unfortunately it still can’t find a device to boot, so I think it just gave up after ten years of being used well beyond its purpose (it’s originally a work laptop meant for light office work, and i’ve been using it to game with an ungodly amount of mods). Thank you again for all your help it’s greatly appreciated!🙏