Head lights wont come on on a 1999 Pontiac Montana what could be the answer the fuses have been check and the light bulbs?

I had a car that had a failed combination switch (the turn signal, hi-low beam, parking lights switch). I could get the lights to come on if I set the switch to high beam, but not low. A new switch and, viola! Verrry expensive to have dealer repair. If this is your problem, hopefully you have a mechanic friend.