Nissan Repair: passanger-side headlight not working, nissan quest, electrical problem

Question
I have a Nissan Quest 2000. The headlight on the passanger-side is not working.
I checked the fuse, but nothing is wrong with the fuse. I even tried changing it, but nothing happened.

From your experience, what possible things could cause this? and action to take?
What's your advice?
Thanks.  

Answer
Ardi, try checking the bulb to see if it is not loose.
If that doesn't solve the problem, you will have to investigate more throughly as to an electrical problem.

Basically that involves tracing the wires to see if there is any bare wires.

Also, it could be the "socket" itself (the headlight socket).