My stick shift won't start. turn key nothing happens No click but lights work

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The car is dead but lights, radio, etc. work. When I turn the key there is no sound at all.Any ideas what it could be be?Checked the starter and that seems fine, externally. I know it's probably a coincidence but the only maintenance I did to the car was to replace a head light the day prior to not starting. Any help would be appreciated. Thanks