Oh no, a non-working laptop keyboard can be super frustrating! Let's see if we can figure out what might be going on. Here are a few things you could check:
* ***Is it just a temporary glitch?*** Sometimes a simple restart of your laptop can resolve minor software hiccups that might be affecting the keyboard. Have you tried rebooting it?
* ***Are the keys physically stuck?*** Take a close look at the keys. Are any of them visibly stuck down or feel different than the others? Sometimes a bit of debris can get lodged underneath.
* ***Could it be a driver issue?*** The software that allows your keyboard to communicate with your computer might be acting up. You could try updating or reinstalling your keyboard drivers.
* ***Is it possible the keyboard got disabled accidentally?*** Some laptops have a function key combination that can disable the internal keyboard. Check your laptop's manual or look for a key with a keyboard icon and try pressing it in combination with the Fn key.
* ***Is it only certain keys that aren't working?*** If only a few keys are unresponsive, it might indicate a more specific hardware problem with the keyboard itself.
Since the question is on iFixit, there's a good chance someone else has encountered the same issue with an HP EliteBook. Have you had a chance to look through the existing questions or repair guides for that series? They might have some specific troubleshooting steps or solutions that could help!