I recently upgraded my power supply from an EVGA 500W to a Corsair RM750e, but now my computer only powers on for about 2 seconds. The motherboard I'm using is an A320M-HDV 4.0. My EVGA 500W worked perfectly fine, but I've also tried using Corsair 1000W and 850W, and they all exhibit the same behavior—when I press the power button, the CPU fan and blue light turn on for just a moment before shutting off. I noticed that the EVGA PSU had a 20+4 pin connector with 1 pin missing, while all the Corsair PSUs come with a 24-pin connector that has 2 pins missing. Any insights on what might be causing this issue?
3 Answers
Did you remember to swap all the power cables as well? Sometimes even a single connector can cause issues when changing PSUs.
Just so you know, many newer PSUs, including the RM series, don't include a -12V rail since it's considered obsolete. That missing pin on the 24-pin connector might actually be something the A320 motherboard needs!
Does this power-on problem happen every time you hit the power button, or does it seem random? Have you only changed the PSU, or swapped any other components?
It happens consistently every time I power it on, and I've only changed the PSU for now.
I used the power cables that came with the Corsair modular PSUs, as the EVGA PSU isn't modular.