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motherboard PSU compatibilty issue

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April 6, 2014 11:16:29 AM

I have an older ddr2 motherboard that doesn't seem to work with a new PSU I bought as an upgrade. The PSU goes into protection mode randomly.

This is actually the second PSU I've had the same issue with ( I assumed a faulty PSU the first time around and RMA'd it.) After getting the same issue on the second one, I tested the PSU on another system and its 100% stable there. I also tried out that second system's psu on the old dd2 motherboard and its 100%.

My question is does anybody know what causes this sort of compatibility issue of if there is a way to fix it? This new PSU should be leaps and bounds better than the old one, it just hates this particular motherboard for some reason.

The motherboard is a GA-MA790GP-UD4H and the PSU is a Highpower Astro PT-700.
a b V Motherboard
April 6, 2014 11:36:45 AM

Theres two CPU powerline connectors with this motherboard make sure you plug the right one in and also make sure both the ATX 12V powerline and CPU power line are secured and go in all the way
They are found here: http://www.mediafire.com/view/22embmqwn6t64ap/example17...

Have you insured that the system works with another PSU?
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April 6, 2014 11:47:37 AM

Thanks, yes the 2x4 and 24pin are both tight.

The system runs fine with the old power supply and the one borrowed from another system. Its only the Highpower PT700 that is giving it fits.

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April 6, 2014 12:53:25 PM

Yep, I'm using the 8pin. This psu comes with both the 8 pin and 4+4. I had tried them both and didn't seem to make any difference, lockups either way.
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a b V Motherboard
April 7, 2014 9:06:04 AM

Could you please describe what happens when the system is turned on?
Do the fans and hard drives spin up?
Does any lights on the motherboard show up once power is connected?
Do you get anything show up on the screen?
Also do you get any beeps from the computer?
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April 7, 2014 6:54:00 PM

System comes up normal when powered on. At a random time later the PSU will go into protection mode and the screen will go off. case fans and lights will stay on. The reset and power buttons are non-responsive.

The psu has to be switched off for several minutes to "un-latch" as the manual puts it the protection mode. Once that clears, then the system can boot 100% again.

It canl run for 5 mins or 3 hours and heavy or light load doesn't seem to affect the issue.

I don't have a speaker hooked up, but that is a good idea. I'll try it when I get a chance and see what happens.
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a b V Motherboard
April 7, 2014 11:41:03 PM

Whet's your system specs?
Make sure that the PSU fan is able to breath fully as this does sound like it could be overheating.
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April 13, 2014 7:41:22 PM

Sorry, haven't put a speaker on it yet to see if there are any beep codes. The Astro PT700 psu fan doesn't come on below 40% load. Thats part of the reason I bought it, for silent operation. It doesn't feel hot to the touch at all.

The system is based on the GA-MA790GP-UD4H mb with a 965be @ 4042mhz (16.5x245). 6gb of DDR2 (4x). With a 270x ,samsung 240gb evo, and windows 8.1 rounding things out.

I've done some more reading and become pretty sure its some weird incompatibility with the 3.3/5v rail protections.
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