Smell the air around the PSU; a distinct burnt odor is a definitive sign of electrical failure and requires immediate replacement. If the PSU fan spins continuously, the unit is receiving power and is likely functional.
Easy Power Supply Checks At Home
Plug the PSU into a wall outlet and turn the power switch on the back to the "I" position. If the PSU fan spins continuously, the unit is receiving power and is likely functional.
Start by examining the PSU casing for any physical damage, such as dents or cracks. A failing PSU can manifest as random shutdowns, component instability, or an inability to power on at all.
Easy Power Supply Checks At Home
Look closely at the vents and fan; dust buildup here can lead to overheating and failure. Before touching any hardware, turn off the computer and unplug it from the wall outlet.
More About How to test power supply of computer
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