Question The brand new PSU doesn't work, but the old one does. Why?

[dbz87]

Hello everyone!

I bought a new PSU (because I have a more powerful video card that needs more watts) and my computer won't start at all.

I'm at the point where only the power sw cable, CPU cable and motherboard cable are plugged in, nothing else.

When I turn on the main power switch of the PSU, the computer gets power (the lights of the motherboard turns on), and then when I press the main power switch of the computer, the fans (CPU, PSU) start for less than a second and that's it. After that, the computer's main switch is no longer responding, I have to turn the PSU off and back on.

I plug in the 24-pin motherboard (20+4) and 8-pin processor (4+4) cables correctly, I can't plug them in any better, my fingers are getting numb from trying so hard and so many times.

I still have my old power supply, with that the PC starts without problems.

I've tried to remove the CMOS battery and put it back, same issue. Also tried plugging it directly into the grounded wall outlet, not the extension cord, maybe, who knows, but...Still...

Motherboard:
Asus Prime B350 Plus

New PSU:
be quiet! Pure Power 11 600W (BN294, not modular)

Old PSU:
Fractal Design Integra M 450W (modular)

Is it possible that one of the +4 pin part is not connected properly? There is no +4 pin on the Fractal, the whole cpu and mobo connector are in one.

I don't know what I'm doing wrong. I'm out of ideas.

Thank you,

 

[USAFRet]

Are you using ONLY the cables that come with each PSU?
As in...completely changing them with the new PSU.

 

[dbz87]

I have modified my question while you were replying, but the be quiet has fixed cables, it's not the modular version. I can't use other cables than the ones that come with it. At most I could use the main power cable of the Fractal, but it won't start with that or its own, I've tried both. But the Fractal starts with the be quiet's power cable.