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Here are a few simple things to try before going deeper:

• Try fresh batteries and check that the battery contacts aren't corroded. DAB radios normally tell you when the battery is low and work fine until then, but this is an easy thing to try.
• Try a hard reset. You will probably find a reset button behind a pinhole in an inconspicuous place, such as under the battery compartment cover. Insert a bent paper clip in order to actuate the reset button. If you can't find it, take out the batteries and leave them out for a minimum of several minutes.
• Check the output voltage(s) of the power supply. Check the polarity and voltage needed, typically anything from 5V to 12v. Most wall cube power supplies have the positive as the middle pin, though some are negative on the inner pin.
• Check the ribbon cables joining the various modules are properly seated, and try reseating them.
• If the display seems to indicate that the radio is working but there is no sound from the speaker, check whether the headphone socket works. If so, the fault is in the headphone socket itself, the loudspeaker, or the wiring between and around them both, otherwise it will be in the audio amplifier.