Question about StarTech.com (ATXPOWER400) 400-Watt Power Supply

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Power supply won't turn on

My PSU will not turn on.
It was working fine until I unplugged it to move the computer.
The LED on the mobo is lit so power must be going there. But I can't get power to the fans and drives....? I tried a different power cord and that didn't work. I tried unplugging my USB mouse but that didn't help.

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  • hyphenguy Jun 16, 2009

    I'll try what you suggested. I added a hard drive a week before this happened. Maybe that pushed it over the edge?
    It's frustrating because I have an old computer that still works and it's 10 years old with original parts!


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You may have a failing motherboard or power supply unit (PSU) then. Just because a mobo has a light on it does not mean that it is getting enough power, just enough to turn that light on. Failure of motherboards and PSU's are usually due to breaking capacitors. A few years ago a capacitor company stole the "recipe" for making capacitors from another company and tried to make their own, unfortunately they did not get the ingredients right and the capacitors started breaking after 2-3 years of use. They sold these capacitors at very cheap prices and a lot of computer companies and power supply makers bought them. This is easy to diagnose. Look for capacitors (caps) (they look like little tiny soda cans) on your motherboard (mobo). They should be perfectly flat on top and not bulged or swelling or leaking anything. There is something in the computer that is not getting enough power and causing it not to start. There are a few companies that will repair broken capacitor issues, if you find that you have that problem. Also if you add a bunch of extra components without upgrading the power supply you can suffer underpowered situations and that can cause internal parts to fail. Have you added any big video cards or extra drives?
And remember a bad PSU does not mean no power, just not enough to run the computer. If you replace the PSU make sure that you replace it with one of the same or greater output watts. Output Watts should be listed on the outside of the PSU itself.
I would try another PSU first if the mobo caps looked good.

Posted on Jun 16, 2009

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2 Answers

I rebuilt computer with new parts, now won't start up. No POST. Power LED lights up, no cpu fans spin, no beeps. Psu works with paper clip test. New mobo, ram, psu, cpu.


Check display without cabinet maybe motherboard getting short with cabinet and try new Power supply check all the power supply connectors connected or not .

Nov 14, 2016 | Computers & Internet

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Mainboard: g31 m7 te - power: antec hcg750 - gpu: gtx560ti


No the mobo is compatible with the Power Supply, and GPU.
And vice-versa.

Mainboard fan???????
You mean the Processor (CPU) fan?

I'm guessing I guess, because computer case fans aren't on the motherboard/mainboard/mobo.
(MOtherBOard)

You're getting power to the mobo, but the question is how much?

1) IF ALL of the LED lights were on at once, they would use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts of power.

3) A typical Processor can use from 51 to 125 Watts of power.
Just depends on what Processor it is.

http://206.108.48.60/app/en/mb/introduction.php?S_ID=363&tab=1

The mobo will support Intel Core2 Quad-Core processors. Depending on which one, you may be talking about Up To 105 Watts of power,

http://en.wikipedia.org/wiki/List_of_Intel_Core_2_microprocessors#Quad-Core_Desktop_processors

This is why LED's can light, and fans may spin, but the Processor isn't getting enough power, so the computer will not turn on. (Processor isn't turning on)

Why?

1) Just because that Power Supply is new, doesn't mean it is good.
Sometimes you get a bad one. Test the three main voltages coming out, with a multimeter set to DC Voltage.

Need guidance post back in a Comment.
(An economical multimeter can be purchased, for as little as $8 to $12. I have seen cheaper. Available in a multitude of stores. An auto parts store is but one example )

2) You don't have the 4-pin ATX +12 Volt power cable plugged in.
Goes to the white square 4-socket hole connector, to the left top corner of the Processor socket.
(Motherboard installed in computer case)

3) REQUIRES -> TWO 6-pin PCI-Express power cables, for the Nvidia GTX560Ti graphics card.

The Antec HCG750 PSU has 4 of them, so no problem there, IF you have two of them plugged into the graphics card.

Both connectors of the 20 + 4-pin ATX main power cable's connector, need to be used. Biostar mobo requires a 24-pin ATX main power cable.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817371049

Post back in a Comment as to power cables plugged in, and DC Voltage test on PSU.

Regards,
joecoolvette

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2 Answers

I seem to have a problem with the power to my computer. After 2 days of searching all kinds of forums I still haven't found a solution. The computer won't power up, no fans are spinning, not a...


First remove the power plug from the smps and press the power switch few time and wait for few minutes the re plug the power connector to the smps and switch on the computer if you still dont have power then you will have to check whether the smps work to test that its not enough to test the voltage in the 21/24 pin you will have to short the green wire and the black wire and see whether the smps fan is working if the fan is not working then the problem is with smps

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I can't get my computer to boot up


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1 Answer

Motherboard no power


In this order:
check PSU is working ( fans run in the psu), test with another psu installed,
See of there is a green LED lit on the mobo
Check capacitors are not bulging or leaking and there are no signs of burned circuit traces on mobo
remove ram and try booting see if you get power to the cpu fan
try bypassing the PW switch and touching the PW terminals on the fpanel header to eliminate swith problem.

If that fails, suspect dead mobo

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In my experience you may need to replace the case but if you feel up to the challenge you can clean the contact headers on the MOBO for the PW LED and try reseting the CMOS for the bios.

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1 Answer

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