Look Up/Down Not Working

I just got a gamepad and am trying to get one of the analog sticks to be bound to look commands, so I tried to do so and up/down did not work. I tried it with one of my keyboard keys and that didn’t work either! So my question is: does anyone else have this problem, and is there a way to fix it?

I’m not sure, but shouldn’t you enable Joystick Look in the settings?

That’s only in HL1. There’s a use joystick button in options, but that’s for movement only.
EDIT: I tried it with the keyboard too.