Final answer:
A symptom of a dying power supply can be a gradual decrease in performance, similar to how car lights dim gradually as the battery runs down due to decreasing output voltage and internal resistance.
Step-by-step explanation:
A possible symptom of a power supply that is dying slowly could be a gradual decrease in the performance of devices connected to it. Much like when car lights dim as a car battery runs down, the devices may exhibit signs of weakness or reduced functionality before they fail completely. This happens because the power supply's output voltage decreases as its ability to deliver power depletes. This is similar to a car's lights that don't simply blink off when the battery's energy is gone; instead, they dim slowly due to the battery output voltage decreasing as the battery is depleted, which can be caused by the battery's internal resistance.
In another everyday example, we can observe this when the refrigerator light dims momentarily if the motor turns on, or when the passenger compartment light of a car dims while starting the engine. These examples illustrate the overall concept of how voltage can vary due to battery conditions and usage stress, which likewise applies to the power supply of computers and other electronic devices.