New PSU dead??

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the_sas_man

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Nov 17, 2013
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10,510
So this one is driving me mad and I'd love your help.

Today I bought a new PSU - an Antec 520w high gamer modular. I wanted to replace an ageing PSU that was over 6 years old and seemed to be fading me.

So today I hooked it up and nothing powered. No fans. No lights. Nothing.

So I disconnected and started from scratch. Plugging in the 24 pin to the motherboard and the 8 pin (4+4) to the CPU and tried the power.

Success!

But here is the weird bit...

If I try and connect a 4 pin or 6 pin to the PSU (molex or Graphics card) it fails to switch on at all. It's like there is no power going through. I've tried just one molex so it's not overloaded and I get nothing.

Have I got a dodgy PSU? Or is it not powerful enough to run my system?

I have an i54670k / GTX 970 / 2 x hard drive / 8gig ram and few USBs etc.

Originally I had a 700w PSU and it worked fine but I downgraded to a 520w as I thought this would still be enough power.

It's driving me mad as I can't work out if I'm doing something really silly connection wise or it's something else.

Thank you all
 
Solution
terry4536
It could be a bad power supply. It is also a possibility that the PSU is detecting a short when you attach those cables.

I would return the power supply. I would recommend a 600 to 650 watt power supply for that graphics card. It will allow you some extra wattage headroom.
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terry4536

terry4536

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Mar 28, 2010
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It could be a bad power supply. It is also a possibility that the PSU is detecting a short when you attach those cables.

I would return the power supply. I would recommend a 600 to 650 watt power supply for that graphics card. It will allow you some extra wattage headroom.
 
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Solution
terry4536

terry4536

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Mar 28, 2010
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The motherboard by itself doesn't draw that much power. That is why I'm wondering about the possibility of a short. It is possible even that the short is in the new power supply cables.

But the last addition to the system was the new power supply (was it not?). And you have to start troubleshooting somewhere. If it turns out that the power supply wasn't the problem , then at least you have eliminated that possibility. You stated that the old PSU was weak to begin with.


The next step would be to breadboard the motherboard to eliminate it. You would need a case speaker for the beep codes (~ $5).

http://www.tomshardware.com/faq/id-2176482/breadboarding-stripping-basics-troubleshooting.html
 
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T

the_sas_man

Honorable
Nov 17, 2013
8
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Thanks Terry.

I'm going to return the PSU and replace with a new corsair 650w.

When I plug back in the old PSU, everything works done. However it is temperamental in that to turn it on I have to switch it on and off at the wall, like it needs a cold reset. Hence the new PSU.

I'll let you know how this new one pans out.

Cheers.
 
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terry4536

terry4536

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Mar 28, 2010
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The Corsair power supplies have really gone downhill. The only series that are still worthwhile are the HX and AX. The CS & CX (and their modular versions are inexpensive, but are notorious for being problematic. They use cheap poor quality components. If you want to stay with Corsair, then I would recommend staying with the HX or AX models of power supplies.



 
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