Two x power supply

[DMG5760]

I have a z400 I'm looking at getting a new psu for it I tryed a atx modular 750 but the computer won't boot with it it will start to turn on the fans the stop and flash a red light and beep as if it's not plugged in right.

So I was looking into using 2x psu ppl were saying to put a paper clip in the green and black connector but will this caus any problems

Also I rather it be set up where they bolth would turn on when the power button is pressed on the tower

 

[Chayan4400]

Check out Add2PSU. It's a small board with a relay that you plug a Molex into from the primary PSU and the 24 Pin Motherboard connector from the secondary PSU, allowing both to start at the same time.

http://www.add2psu.com/

However, the two PSUs' outputs have to be almost perfectly matched, close enough so that wiring resistance between the PSU and loads is high enough to provide adequate current balancing. In a real redundant/load-sharing PSU, reference and comparator outputs would be shared between units to guarantee nearly perfect balance. I recommend against using 2 PSUs for this reason.

What 750W PSU model are you using? A PC should start with any PSU that provides sufficient voltage. Failure to do so points at your PSU being faulty. Test it in another computer to be sure.

 

[DMG5760]

dps-475cb-1a this is the one that came with the tower and works

corsair cx750m got this thinking it would work still could take back if had to

 

[Chayan4400]

If I had a Dollar for every CX-series PSU I've seen replaced... I wouldn't be rich, but I'd have enough to buy a replacement for when the next one fails.

Many people underestimate how important the PSU is, and think that because Corsair is well-known their PSUs are good. They aren't.

Some merits of the CX-M series:

• 
  ■ Shoddy soldering.
  ■ Parts of the maetal casing touching the underside of the PCB.
  ■ Taiwannese CapXcone and Teapo Capacitors.
  ■ Generally sub-par quality (Wires worn down inside by abrasion, for one).\
  ■ Shut down under load when tesing at ~45C (A relatively normal temperature for PSUs).
  ■ 80+ Bronze certification done at 30C, not the normal 50C.

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story4&reid=416

It ranks Tier Four on Tom's Hardware's PSU Tier List (Link in signature). Quting from that article:

Tier Four

Built down to a low price. Not exactly the most stable units ever created. Very basic safety circuitry or even thin gauge wiring used. Not for gaming rigs or overclocking systems of any kind. Avoid unless your budget dictates your choice.

There's a good chance it's faulty. Try it out in another PC or take it back to the store and get them to test it. In any case, don't trust any enthusiast GPU to it. Return it for a refund and buy another, better PSU that ranks at leat Tier 2 on Tom's Hardware's PSU Tier List (Link in signature).

 

[DMG5760]

Is that a 750 peek or normal load... And I went to cooler master powersuply calculator and it recommended a 460 so I figured a 750 should be plenty

 

[Chayan4400]

Is that a 750 peek or normal load... And I went to cooler master powersuply calculator and it recommended a 460 so I figured a 750 should be plenty

More watts doesn't necessarily mean the PSU is good. I can get a 1000W PSU for $20. Doesn't mean it will run Titan X SLI without self destructing. The CX-series is low quality for the reasons I listed above. What are your components?

 

[DMG5760]

Z400 workstation
Cpu w3550
3x2gb ddr3 memory correction
DVD drive

Mods
Ssd 240
Evga 970
And plan on psu

 

[DMG5760]

Just tryed my 1000wat seasonic platuam modular form my main tower and its doing the same I only have old school 20pin ones left to try so yea

Going to try non modular just to see what would happen once I find one or just use 2x power supply

 

[Chayan4400]

That explains it. The Z400 -like many of HPs business machines- uses a propietary PSU. No other PSU is going to work without modification. Keep in mind that yoou should do this only if you are comfortable with soldering and re-routing a few wires. Routing the wrong wire to the wrong connection won't kill you becuase all power inside the PC is DC, but could very well short circuit your components. If you are willing to, here is what you need to change:

The picture shows the original HP Z400 475W wiring scheme; the three marked pins show where HP differs to ATX 24 pin standard. This is what you need to change by building an adaptor from a 24-pin extension cable and a couple of molex extensions:

Basically, you need to cut off the male side of both molex extensions, as well as the wires that go to pins #12, #23 and #20 on the male side of the 24-pin ATX connector (You can remove those wires from both ends if you want). Then, you need to re-route the two yellow 12V wires from the molex extensions to pins #12 and #23 respectively, and then one of the black wires from one of the molex extensions to pin #20. Plug the female end of molex and ATX extensions into the corresponding ports on your replacement PSU and then everything should start up.


Your components don't need a 750W PSU. Return the CX750 and buy a better quality 550W PSU for the same price. Anything from XFX or Seasonic, along with EVGA's B2, GS, G2 and P2 lines is fine.

http://pcpartpicker.com/parts/compare/evga-power-supply-110b20750vr,evga-power-supply-220g20650y1,seasonic-power-supply-s12ii520bronze,xfx-power-supply-p1550sxxb9/