Netbook, old Lenovo X230i, required a W10 reset - and upon reset, the '3' key doesn't work. As far as I know, though I don't use this notebook frequently, this wasn't an issue previous to the reset. A coincidence that the '3' key stopped working, when I resetted its W10? Cleaned as best I can the '3' key on the keyboard. When I press down on the '3' key, it feels normal - not that's a good diagnostic. I rebooted, nup. Uninstalled and re-installed the keyboard drivers, nup. Changed language & keyboard settings away from its default, nah. Changed language & keyboard setting back to its default settings, nah. is it a case of sourcing a replacement keyboard, and taking apart this netbook?