I've been using my Latitude E6410 for a few years now and it's by far the best laptop I've ever had.
Recently, my backlit keyboard stopped working. It's something that you don't appreciate enough until you lose it... 🙂 So I got a new backlit keyboard for it and installed it, but it still doesn't work.
I wonder if it could be a problem that's unrelated to the keyboard itself - maybe some motherboard issue / bios bug / whatever. Or maybe the new keyboard I got has its backlit feature broken.
Please note it's been my computer for a while now, so I know all about how to activate it (alt+right arrow / bios setting). also note that it doesn't work even before the OS loads, where it used to work perfectly earlier.