HELP!!! I've got a 91 S10 that doesn't seem to have headlights anymore.

The actual headlights are good. I've tried a new headlight switch. No blown fuses internally. Still, no headlights.

Both headlights went out at the same time. Parking lights and tail lights work. Everything works accept the headlights.

Any ideas?

look for fuses/relays...but without chasing it,I'd say the dimmer switch...

yes try the headlight dimmer switch.