2000 Volvo V40 Havng headlight issues

Both right and left low beam headlights won't come on, bright headlights work. My husband checked the bulbs and they both look ok, the fuses check ok also. He says the wires don't seem to be hot coming from the fuses. He thought maybe the headlight switch was bad and ordered one online a used one, got it hoping that was the problem but changed to the ordered one and they still won't work. Could it be the switch and the used one was bad? What should he try to check out and where should he start? Maybe there is something he is missing or is doing wrong. I'm currently laid off and can't afford to pay the dealer $140.00 an hour to see if they can find out what is wrong. Thanks for your help I really appreciate it. If you lived close I'd make you some cookies.