Dashboard light not working on 2008 Kia Optima

When i turn my headlights on my dash light won't light. I cannot see the speedometer, etc. Why? and more so how do i get it to light again? It wasn't the fuse, at least the mechanic said so.

1 answer
Just the instrument panel won't light... Or all inside illumination doesn't work... ie... Stereo, heater controls etc?? Surely this "mechanic" TESTED the correct fuse and checked the dimmer control..!.?