High-beams work, Low-beams dont... 1991 240SX w/ the pop-ups...any suggestions?

[KwayKer]

The other day I realized in the evening that my headlights werent on, but they should have been. Anyway, the high-beams work, and the low beams dont. I took out the headlights and they seem fine, no rattling when I shake them, so I doubt that both filaments would have blown at the same time. I also checked the fuse box, but no fuses were blown that I could tell. Which fuse should I be checking for exactly? I know they are labeled but sometimes its confusing. Also, when I turn the knob that turns my headlights on, there is a clicking noise coming from somewhere near the fuse box in the engine. Again, my car is a 1991 240SX w/ the pop-up headlights. Everything else works totally fine, I just cant figure out whats up with the low-beams. Any help, comments, or suggestions would be most appreciated. Thanks in advance!

Matt