Did my New Power Supply Fry my CPU?

[insanekiller1]

It all started with this dumb new Corsair power supply that I got from Best Buy.

When I went to plug in and test the new PSU, I plugged in only the 24-pin and 8-pin CPU power. All was fine. I proceed to insert the new PSU into my case and get it all cable managed. I tested it again, with only the 8-pin and 24-pin in and it worked fine as suspected. But after I plugged in my peripherals into the PSU and turn on my computer, it immediately shut off after turning on.

After that, I try and turn it on and nothing. I tried to almost everything to get it working. Another PSU, reset the CMOS, took it out just in case it wasn't shorting, re-seated all the connectors, etc. That did nothing.

Then after getting really frustrated, I tried to test the PSU on another machine to see if it was at fault. I plugged in the 8-pin CPU and 24-pin power and it turns on fine. But as soon as I plug in the peripheral connectors into the PSU, it immediately powered off when I powered it on. Now with a twist, no matter which power supply I use on that computer, it turns on and immediately turns off. I have tried all the troubleshooting with this PC as well.

A day later, I thought to myself, maybe it's the CPU? So I go to the second computer that I tested with the PSU, and I went ahead to take the CPU out, and... you guessed it, it turns on without immediately powering off.

I then go back to my computer that was originally going to have the new PSU in it, and I take the CPU out, and the motherboard turns on. Put it back in, nothing happens.

Does this mean the power supply fried both CPUs?

EDIT: System Specs
Windows 10 64-bit Build 1803
Ryzen 5 1400 @ Stock
MSI B350M Gaming Pro
XFX RX 480
2x G.Skill Ripjaws 8GB 2666Mhz

 

[DRagor]

Put CPU back into motherboard, and try with 24-pin cable connected but 8-pin EPS cable NOT connected.

 

[PuperHacker]

Possible. Contact corsair IMMEDIATELY. The fact that both systems had the same symptoms is a manifestation of PSU malfunction. What do you mean when you say peripherals? What if you unplugged them? Just out of curiosity, which PSU are you using?

 

[insanekiller1]

Put CPU back into motherboard, and try with 24-pin cable connected but 8-pin EPS cable NOT connected.

Nothing. Still doesn't turn on.

EDIT: Same effect on the other computer. Turns on for a split second and turns right off.

 

[insanekiller1]

Possible. Contact corsair IMMEDIATELY. The fact that both systems had the same symptoms is a manifestation of PSU malfunction. What do you mean when you say peripherals? What if you unplugged them? Just out of curiosity, which PSU are you using?

I would contact Corsair, but they are unfortunately closed on weekends.
As soon as I plugged in peripherals (as in, molex, sata power, and PCIE) damaged started to happen.

Right now, I have the peripherals not connected to the the PSU and I'm testing the Mobo with only CPU and mobo power. I don't really want to test it again on another system because it might fry that one as well.

New PSU: Corsair CX650M

EDIT: Grammar

 

[DRagor]

Put CPU back into motherboard, and try with 24-pin cable connected but 8-pin EPS cable NOT connected.

Nothing. Still doesn't turn on.

EDIT: Same effect on the other computer. Turns on for a split second and turns right off.

This looks like SCP is kicking in with CPU installed. If this happens now with two different PSUs, this would mean either motherboards or CPUs are causing short. Since they were fine before you used the Corsair PSU, logical conclusion is that PSU caused the damage. However, it is hard to tell which part has been damaged, CPU or motherboard.

 

[Sohom]

maybe, but if your cpu is fried, looking at it you would be able to say that with some marks on the cpu. Yeah it seems the PSU caused the cpu to fail but something tells me that the psu might have shorted out the motherboard too.

 

[mdd1963]

Did you use the cables that came with the new PSU, or plug in the old SATA power cables into the new PSU hoping the pinout was the same at the PSU connection/insertion points, assuming a modular/semi-modular PSU...? A difference in pinout among PSU cables can fry things pretty quickly...

 

[insanekiller1]

Did you use the cables that came with the new PSU, or plug in the old SATA power cables into the new PSU hoping the pinout was the same at the PSU connection/insertion points, assuming a modular/semi-modular PSU...? A difference in pinout among PSU cables can fry things pretty quickly...

My previous power supply (EVGA 500W White) was non-modular, so I had to take the entire thing out. And yes, I did use the cables that came with Corsair.