instrument lights and radio lights

I need some help with my park....heres the problem. got in the car turned on the headlights and noticed no instrument lights and no radio/clock. checked all fuses and they were good. started fooling around with different things and this is what i found. with the twilight sentinal off and headlights off the radio/clock display and the passenger temp control display works. if you turn of the headlights or park lights on with the switch in the drivers door the radio/clock display and pass. a/c display go out. same thing with the twilight sentenal. with it off radio/clock works switch it on and displays go out. during all of this i never was able to get the instrument lights to come on. what gives? need help bad thanks

Sounds like a dimmer problem

Try moving your instrument panel dimmer switch back and forth hard and fast several times. Sometimes that will make it work. Why? I don't know, but it has worked for me.