I see issues all the time with external power cubes. Devices goes wonky, look up the spec, find it's DC 12v @ 2 amps or whatever and replace the power supply.

I see issues all the time with external power cubes. Devices goes wonky, look up the spec, find it's DC 12v @ 2 amps or whatever and replace the power supply. About 90% of the time the device is happy again.