press the power button, then mash F2 till you see the bios screen popup.
(Sometimes the bios key is F10 or F12, so if F2 doesn’t work just redo the steps but try those keys instead.)
Once you’re in the bios, you can use the arrow keys to navigate. Assuming the arrow keys work, you can navigate to a a section with the name “security” or something similair.
(If you press the arrow keys and nothing happens, your keyboard is broken.)
Once you are there you should see an option to “set an administrators password”. click on that and press a key that you know doesn’t work. if nothing is inputted into the password field then the keyboard is definently broken.
to exit the password input field simply press esc, and then you can navigate to exit, and select exit discarding changes.
If you got to step 5 and everything worked then it is definently an issue with the OS.