During a night departure, the airplane impacted trees 65 feet above the ground, approximately .25 mile from the runway after executing a turn left of 90 degrees. The airplane came to rest in a lake. The runway in use for the dark night departure was 20. The runway was located in a depression on top of a mountain shrouded by fog and clouds, providing no horizon for a visual reference. Examination of the airplane's electrical system revealed that at the time of impact the instrument panel lights were not illuminated. The switch was in the on position. The instrument panel lights circuit breaker was found popped. Evidence of the pilot striking the left side of his head on the instrument panel and the significant injuries to the left side of the torso and extremities indicated the pilot was reaching down with the right hand, with the left hand on the yoke, in an effort to reset the instrument panel light's circuit breaker.