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Why won't my Corsair CX430 PSU power my system but a different one will?

post #1 of 27
Thread Starter 
I am trying to power a new low-end work system built on a Gigabyte GA-A75M-S2V motherboard with a Corsair CX430 PSU. I have connected everything, but when I switch on the system, the fans only spin up briefly (1 second) and then everything is lifeless. It seems like the system isn't getting enough power or something. I have tried with known working OCZ 500MXSP PSU and the system powers up like normal. I assumed the Corsair PSU was bad so I obtained a replacement, but it produces the same results.

Is this PSU just incompatible with the motherboard? What am I missing? Thanks.
post #2 of 27
Is this your sig rig? if so then it its kind of a miracle the 500 watt PSU even worked. You are easlilty drawing 600 watts peak load, get an 850 watt PSU and be safe.
post #3 of 27
What other parts do you have there? Maybe something (CPU, GPU) hits the amp limit of the 430s 12v rail, which triggers the protective shut-down. Can happen also if you have multiple HDDs that spin up at the same time.

Quote:
Originally Posted by mothergoose729 View Post
Is this your sig rig? if so then it its kind of a miracle the 500 watt PSU even worked. You are easlilty drawing 600 watts peak load, get an 850 watt PSU and be safe.
Obviously not, did you read the OP?
Edited by ronnin426850 - 10/15/11 at 1:06pm
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post #4 of 27
Another thing it could be, is if the motherboard requires an 8 pin power and you only have 4 pin on that PSU, or 24 pin ATX and you only have 20 pin. You might need an adapter. Otherwise, is the system is fairly low end, I can't think of a reason why both power supplies would not work.
post #5 of 27
Quote:
Originally Posted by mothergoose729 View Post
Is this your sig rig? if so then it its kind of a miracle the 500 watt PSU even worked. You are easlilty drawing 600 watts peak load, get an 850 watt PSU and be safe.
What he said ^^^^^^^^^^^

Just be thankful you didn't blow your system up. I can't believe you actually tried running your rig with that psu.
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post #6 of 27
Shows how much people read threads lol

It could be shorting out on something.
 
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post #7 of 27
Quote:
Originally Posted by Chuggerboom View Post
What he said ^^^^^^^^^^^

Just be thankful you didn't blow your system up. I can't believe you actually tried running your rig with that psu.
*facepalm*
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CPUMotherboardGraphicsRAM
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2x Seagate 3Tb Samsung 850 EVO 120 Scythe Ninja 3 Rev.B Windows 10 Pro 
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Fujitsu Siemens A17-2A Logitech K280e SuperFlower SF-550K12XP Thermaltake Versa H25 
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Athlon 750K 4.0Ghz AsRock FM2A75 Pro4+ Sapphire R9 270X Dual-X Kingston 2x4Gb 1600 
Hard DriveHard DriveOptical DriveCooling
Samsung 850 EVO 120  Western Digital 320Gb LiteON DVD-RW CoolerMaster Hyper Z600 
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post #8 of 27
Thread Starter 
No, this is not my sig rig! haha. This is an entirely new build I'm working on that will only be used for web browsing. My sig rig peaks at 890W from the wall.

The system consists of the Gigabyte GA-A75M-S2V motherboard, Corsair CX430, 320GB WD Caviar Blue HD, 2 x 1GB Crucial DDR3-1333 RAM, AMD A4 3400 APU. That's it! If anything, 430W is overkill.

The motherboard has a 4-pin 12V connector and the PSU supports 8-pin so I just plug in half as directed on the Corsair web site. I used the half that matched the header first, but I tried both halves for good measure once the machine wouldn't power up. The motherboard and PSU both support a 24-pin ATX connector.
post #9 of 27
Thread Starter 
Quote:
Originally Posted by Mhill2029 View Post
It could be shorting out on something.
If it was shorting out, why would the OCZ PSU work fine? I have now seen the same behavior with two different CX430s as well. Are you saying it's just a bad design by Corsair and all their units short out on this motherboard?
post #10 of 27
Oh God... JUST READ PEOPLE!

I would guess that you are building an HTPC/Home theater box...

If you have a digital PSU tester, plug it in and check the latency. If it's anything over 300 ms that might be the problem. I have seen some low-power PSU work fine in older systems and not booting in newer ones, yet the power requirement where the same. 1/3 of a second is a long time to compensate for power drop...

If you have a working PSU handy and it fits physically in your box, why not use it. Even if you plug a 1000W PSU in a 300W system, it won't use more electricity or generate more heat. the 500W will also give you a little headroom for some extra USB devices (each two plugs use 12W for USB2.0 and 24W for 3.0) or HDDs.

If you have a video capture card or TV Tuner, keep in mind that this will draw power from the ATX connector and might cause a sufficient drop for the VRM to shutdown (less voltage = more current = more heat = triggers safeties) when added to the HDDs spin-up and bad potential latency of the PSU.

I might be completely lost too, but I would start by checking what is the actuall difference between both PSUs.
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