No power to radio, cigarette lighter

This one's the fusebox in the interior of the car; usually below the steering wheel in a panel with a thumbscrew that you just give a quarter-turn, then catch it as it opens; inside are some fuses, which tend to be obvious when they are blown. There's a little legend that tends to be well-lit too, indicating which fuses were for the ligher/'auxillary 12v power' socket. Don't let a failed lighter bust on you; a flaming car is much more expensive than tossing/replacing the bad part or plugging something else in.