A power supply is a device that supplies electrical power to a load. Power supplies are used in a wide variety of applications, including computers, televisions, and other electronic devices. A dead power supply is a power supply that is not functioning properly and is not able to provide power to a load.
There are a number of ways to check if a power supply is dead. One way is to use a multimeter to measure the voltage output of the power supply. If the voltage output is zero, then the power supply is dead. Another way to check if a power supply is dead is to connect it to a load and see if the load is able to function. If the load is not able to function, then the power supply is dead.