How to Diagnose Power Supply Failure?

The following situations may cause this issue

Case 1: The LED on the power supply does not light up; Case 2: Amp/Preamp does not turn on; Case 3: When plugged into the Amp, both light on the amp & power supply start blinking; Case 4: Amp/Preamp make the noise; Case 5: Sound shuts off by itself

Possible solution

Check if the power supply is illuminated when plugged into to AC by itself.

Plug power supply into different socket.

Test the adapter with a meter.

Try a different power supply (within a range of DC input).

Test the included power supply on other electrical equipment.

Please watch the tutorial video by clicking on the link provided. https://youtu.be/yCjygS03zTE