PSU Compatibility?

[anevmerj]

This is an issue I have never seen before and don't even understand the mechanics behind how it could be possible.

I recently purchased a newish motherboard and cpu, B250I Pro by MSI with a Pentium G4560 (please don't judge I just wanted something simple and compact) and the system works with one caveat the power supply that I wanted to use, a 500W OCZ, does not want to work with it. Here's the part I don't understand if I use a 400W Corsair PSU, with inferior or equal current ratings for all the rails, the system boots no issue but if I then take both PSUs and connect them to my old system, AMD Phenom II X4 955 and some random Asus board, both supplies work without issues. I have tried re-seating the connectors and running the board with only the CPU and ram installed and both system and PSU dont turn on with the 500W supply. Any thoughts on the matter would be nice.

[Fasauceome]

Have you tried frankensteining the PSUs together? Maybe pull the 24 pin and 8 pin EPS off the PSU you want to use, and the PCIe cables off the corsair one, you could isolate which connections your PC is having a hard time with.

[Cyracus]

21 minutes ago, anevmerj said:

Pentium G4560 (please don't judge

That's a ballin budget cpu, not that long ago it was the cpu to recommend for budget builds. 

[anevmerj]

39 minutes ago, fasauceome said:

Have you tried frankensteining the PSUs together? Maybe pull the 24 pin and 8 pin EPS off the PSU you want to use, and the PCIe cables off the corsair one, you could isolate which connections your PC is having a hard time with.

Nope. Wouldn't really achieve anything since I only have the cpu 4 pin and 24 pin connected with no PCIe devices on the board.

[Fasauceome]

1 minute ago, anevmerj said:

Nope. Wouldn't really achieve anything since I only have the cpu 4 pin and 24 pin connected with no PCIe devices on the board.

You could find out by doing the process anyway, but you can just reverse the EPS and 24 pin, via each PSU.

[anevmerj]

Update: Tried a third Core 2 something board I had lying around and Corsair PSU works with it and OCZ doesn't. 

[TrigrH]

is the OCZ psu haswell compatible? 

[anevmerj]

21 minutes ago, TrigrH said:

is the OCZ psu haswell compatible? 

I would assume no, but would that affect the inital turn on since it shouldnt been in sleep mode until after boot so I would expect the system to turn on, fans to spin on cpu and power supply and then it to shut down.