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Do the high beams work? Also was there any work or accidents prior to this?
When you replaced the low beam that was bad is it working now and do the high beams work and is the DRL light on?
Ok there is a very good chance both bulbs are bad see this more times then you would ever think and need to start there regardless this is the cheapest option as well.I would start here next .
The DRL is the daytime running lights.
Ok with the headlight switch on check for poor to the headlights at the connector .It very well can just be a blown fuse or a bad headlight switch this is the next step let me know what you find.