A-lex

I jump started my 04 LS430 and heard a pop but everything seems well and working. Nothing wrong shows on the instrument panel. But by night when the lights came on, i motived that the driver side head lamp was aimed too low and the the driver side at usual level. When starting the car and turning the lights on, only the passenger side lamp moves up and down then levels off. The drivers remains steady. Has anybody experienced the same? What's busted?Any recommendations? Please help