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It's most likely that your headlights are just dead. There are separate filaments for your headlight and your highbeam, so odds are both headlight filaments are burned out, but your highbeam filaments (which probably get used less) are still fine. It's not unusual for both headlights to burn out at the same time. Throw in another pair of headlights, it's probably the cheapest thing to rule out and the most likely solution.

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Q: Why do my Jaguar's headlights only work with the high beams on?
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