For 3 years, I've used my Fn without a problem. I've used it to switch between my F5 key and the play/pause button for example. And I've most often used it to turn my arrow keys into pageup/pagedown/home/end keys. I'm also familiar with the Fn lock with the escape key. But a few months ago it started becoming less reliable and now it doesn't really work at all. I don't really care about the media keys, but I can't execute page up/down or home/end without an external keyboard now.
Is there some software setting to allow me to get to a home/end pageup/pagedown command?
Is there a hardware solution that I might try to address it? I am comfortable taking a screwdriver to the hardware (less so with a soldering iron though).