I once was working on my family's business during summer and was doing something on the laptop that was there (according to the owner, it was in a "good shape" - oh my god that laptop nearly gave me cancer: an old Toshiba, running W10, with half the F keys not working - specially F5. I CAN'T LIVE WITHOUT F5 OH MY GOD -, and also the ➡ key (arrow keys). It was bought in a flea market and some IT guy, a friend of the owner, repaired it a bit and installed the OS because a laptop that old ran WinXP or Win Vista for sure) when suddenly it died on me.
I rebooted the thing and right before the time it should be showing the windows logo, the screen froze (on a black screen with some text) and it started to beep. Loudly. A loud continuous beep. I turned it off and on some times after that, seeing if turning it off and on did something (as it seems to work LoL) and it continued with the beeping. After a quick search I found out that that was a common problem with Toshibas that old, and that I needed to press F2 (that key worked thank god) when the black screen with the text showed up (I don't remember what was written there, it were some booting instructions, I think).
It worked. Great. Now the N key doesn't work when I press it. Greeeeeeeaaaaaat. Also it seemed that, when I opened the start menu, it would automatically write "nnnnnnnn(...)" without me pressing any key (pressing any key would make it stop though, maybe it was stuck).
Then I told the owner not to turn it off, because the laptop would start beeping and such (and I know he'd panic about it).
From then on I think it went off for good and now he's been using his own Toshiba, that runs Vista and is slow as all hell.
Moral of the story: he should have been used his crappy PC from the beginning, at least all its keys work

(Note: watching him type hurts my soul. When one is used to use both hands to type, and is fast-ish on the keyboard and uses tabs to change fields, watching someone type with only one hand every 2" or so and using the mouse to change fields hurts. So much time wasted 😭)