Tail lights and dashboard lights out , help please

2000 Chevy Impala V6

My dashboard lights, the radio lights, and lights on the doors are all out. In addition the tail lights are also out.

Everything else works fine, and I've already checked the fuses and they are all fine (The fuses in the fusebox on the inside of the car)

Then I went to autozone and they didn't know what to do, so if someone could please help it would be greatly appreciated.

as far as the dash lights go..i had the same exact problem..it was the headlamp/dimmer switch. i am not sure what the issue is with the tail lights though. the dimmer switch is easy to switch out. i had to change mine too. the dealer wanted wayyyy to much to do it. i hope this helps