An aftermarket radio should not have anything to do with it. Usually just one bulb goes out and part of the display is still visible. The bulbs "back-light" the dark lens so the LCDs behind it can be seen. If yours is toast, the replacement is easy. Two tabs and a connector and its out, once the dash bezel is off. The bulbs are a wierd number that may have changed. Take your old ones out to check them and / or reference at the bulb gettin place.