Bought a used car and the Dash board light is out what could be wrong?

My first guess is a fuse but since you checked it I would check to see if there is a light control. I was using my mother's truck last week and the lights weren't working so I started fiddling with things and found a light adjuster to change the brightness.

It culd be a bulb, a loose wire, or a fuse. I have had vehicles in which I thought the fuses were fine, but they really weren't. Since that it the easiest part to change, I would go ahead and change them anyway, even though thet appear to be fine. If that doesn't do it, I would go onto the bulb and wires. I figure that they will both be a bit difficult to get to, so it would probably be best to check both at the same time. If I am thinking right, you ill have to take the dashboard cover off to get to them both.