Asus P6X58D-E wont turn on, red onboard switch lit

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Mephastophilis

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May 20, 2013
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Hi

No significant event to cause this, PC won't turn on, no fans, post etc. I would blame the PSU but the onboard power switch is lit and my USB headphones are also lit (normal even when PC is powered down). PC won't turn on when using the onboard switch too, no response.

Does this sound like the PSU still or am I looking at mobo/cpu issues?
 
Solution
John_VanKirk

Thanks, I forgot to mention that on ATX PSUs, there is the 5V StandBy line, which may still supply 5V to LEDs or USB headers. It can still be the PSU, or the PowerOn switch on the computer, or a MB problem where the PSU never gets the Voltage Good signal back from the MB to start full power. Some MB's have a Power switch button built on the MB, which you could push to rule out the case Power switch as the cause.

I have a couple different PSU checkers...
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John_VanKirk

John_VanKirk

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Hello, & Welcome to Tom's Hardware!

Well, if it has been running fine until now, and presently you don't see any fans spin up then it's almost certainly the PSU.
What is the brand and model # and wattage of the PSU you have in it?
Check the CPU fan, & the back fan to see if they spin up. The power to those probably come from the small 3/4 pin connectors from the MB. Next listen to the HDD's to tell if they spin up.
To be more scientific, you could measure the voltage on any molex (yellow to black wires) with a DVM. Should read 12 V. Lastly if you have access to a PSU checker like the image here, that would tell you for sure if it's bad.



Let us know what you find, and someone can give you the next best step to take.
Having a PSU fail, whether just from age or a power surge, etc. is not that uncommon.

 
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Mephastophilis

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May 20, 2013
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Thanks John. Its a corsair CX600 (600 watt). Its less than a year old. I will try to get my hands on a PSU tester. I'd like to draw attention to the fact the on board power switch is lit. So some power is being passed, same to the USB port. Does this sound likely for a failed PSU?
 
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John_VanKirk

John_VanKirk

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Thanks, I forgot to mention that on ATX PSUs, there is the 5V StandBy line, which may still supply 5V to LEDs or USB headers. It can still be the PSU, or the PowerOn switch on the computer, or a MB problem where the PSU never gets the Voltage Good signal back from the MB to start full power. Some MB's have a Power switch button built on the MB, which you could push to rule out the case Power switch as the cause.

I have a couple different PSU checkers, including the one in the photo. Cost is about $25, and I think it is worth the time and cost of getting one. Then you know for sure you are sending back a defective PSU for replacement, rather than pulling it out, and sending it back, only to find out it checks out OK.

 
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Mephastophilis

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May 20, 2013
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Agreed. I'll look for a PSU tester. The standby line makes sense. There is a motherboard power switch which is lit but also has zero response, so fault definitely lies with the internals. Fingers crossed its the PSU. Should be in warranty and as you said, most common point of failure.
Thanks again John.
 
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