Electronics Repair Questions? Ask an Electronics Technician
It's possible that the AC power cable is faulty, the connection into the DAB radio is damaged, or the radio's circuitry has a fault.
First, try a different, compatible AC power cable.
If that does not work, try wiggling it around in the jack connection, in case the connection is damaged or has an intermittent fault.
If there is still no response, then the radio has an internal fault which will require a repair.