Leo shows you how to diagnose your ATX power supply step by step before you buy new one when your computer doesn’t crank up – Link.
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HOW TO – Diagnose an ATX PSU (Power supply unit)
The only time i’ve had to replace a PSU is when (during boot-up) one of the Al electrolic caps exploded, sending scraps of metal casing everyware. One of wich shorted a few components next to the high frequency switching transformer. It made a pop, then wall behind the computer light up with blue light, and then it stank like burning dust.