New build trips circuit breaker

I'm putting together my first homebuilt computer. had everything setup correctly (I think). Went to turn it on for the first time and the circuit breaker tripped.

I reset the breaker, only connected the minimum necessary to start. The 20+4 power and the 4+4 12v. Tried again, same result.

The only thing connected are the cpu w/fan and 4 ram. I have a video card in the slot, but disconnected the power. I also have the connections for the power/hdd light/led light connected.

What I do is plug in the psu, turn on the power switch on the psu and then when I press the power button on the front of the case, it trips right away. One time, it took about a second to trip. The CPU fan ran for about a second and then trip.

I don't think I'm overloading the circuit with normal use since I use the same plug for the vacuum cleaner and it doesn't trip.

One thing is the 12v connection has connections with the square ends and the rounded ends and it's impossible to get everything to line up with the power supply. The power supply connection consists of 2 - 4 pin connections side by side and they're right next to each other so there's no way to reverse them and the clips line up with the clips on the motherboard, so there's only one reasonable way to connect it, but the reasonable way results in squares in rounded holes and vice versa.

This is my system (from NewEgg)


1 x HD 750G|SAMG 7K 32M SATA2 HD753LJ

1 x PSU ROSEWILL|RG630-2 630W

2 x MEM 2Gx2|GSK F3-10600CL9D-4GBNT


1 x VGA XFX|HD-487A-ZWFC HD4870 1G


I haven't had an opportunity to try another psu. I can probably do this today.

Anyone have any suggestions for me to troubleshoot?
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More about build trips circuit breaker
  1. You may be using the wrong plug. You may be using a PCI-Express 8-pin plug. Everything has to fit easy without forcing. Squares have to go with squares.

    "New build won't boot" checklist
  2. evongugg said:
    You may be using the wrong plug. You may be using a PCI-Express 8-pin plug. Everything has to fit easy without forcing. Squares have to go with squares.

    "New build won't boot" checklist

    It's not the pci-express 8 pin plug. I use that on my video card. It's a 4+4 plug, not a 6+2 plug.
  3. The 4+4 has to have a way to plug properly into the 8pin motherboard plug. Forcing a plug in the wrong way is guaranteed to cause a problem.

    That PSU will pull 10 amps at 115V or 5amps at 230 Then you have to add the monitor, lights and anything else on at the time. that may be more than your vacuum.

    Its also possible that Rosewill PSU is bad and causing a short. There is a reason no one here recommends Rosewill PSUs.

    Also its possible your motherboard is shorted on the case or something. Did you breadboard it to be sure the motherboard touching the case causing a short isnt the problem?

    Following the "wont boot" checklist evongug linked is the right thing to do.
  4. I tested with another PSU and the problem appears to be with the Roswell PSU. It's shorted on 2 computers and anothe PSU works fine on both.

    Thanks for all your help.
  5. If you can, buy a Corsair, Seasonic, OCZ or Antec (Signature, TruePower, Earthwatts). They are far more reliable than Rosewill.
  6. I will second buying a corsair. You shouldnt have any problems out of one of those.
  7. I was going to say try the psu in another pc to see if its psu but I guess you've already done so.

    I would by any of the psu that dndhatcher but for my next build, I'm going to buy an XFX psu because of there new ad. LOL
  8. Did you put the stand-offs between the motherboard and the case/tray?
  9. Stand-offs are in. It seems to definatly be a bad PSU.

    I'm asking for a refund from NewEgg for the Rosewill and will get the
    OCZ ModXStream Pro OCZ700MXSP 700W ATX12V V2.2
    from Microcenter.

    The reviews are good. 10% give 1 star on NewEgg, but many of them are because the rebate didn't work. A 5-10% failure rate is about as good as one can expect from a PSU. Plus, if it fails, I can drive to MicroCenter as opposed to paying $12 to ship back to NewEgg in addition to a 15% restocking fee. I can live with having to pay to ship back since most vendors do this, but to charge a 15% fee to give them back a POS they sold me makes no sense.
  10. Yeah if you can just drive and return that is a great thing. Too bad we only have best buy out here in hawaii. /cry
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