Power issues ASUS P8P67 Pro & Corsair 850HX

[GamingRig]

I recently finished building a new gaming rig for my son. Everything seems to be running smoothly except for power issues I'm having since the beginning of the build.

Occasionally when I disconnect, move the computer to another area and try to reconnect, the system would not power on. I can see that the mobo power led is on, but the computer would not power on. I have to unplug and re-plug the 24 pin connector to the mobo and then the system would power on. We also had few incidents when the computer would power off, and then I disconnected and reconnected the 24 pin connector in powered on.

The system ran fine for 3 days and yesterday I took it apart, reseated the motherboard, reapplied the thermal paste and the computer runs cool on idle 30c, while gaming 45c-50c and under stress test using IBT and Prime95 would go up to 63c - 65c.

The issue is intermittent and I'm trying to figure out if I should RMA the power supply or the mobo. Unfortunately I don't have another 'beefy' power supply to test with nor do I have a multimeter to test the PSU.

- Antec Mid-Tower Gaming Case Nine Hundred Two V3
- ASUS P8P67 PRO LGA 1155 SATA 6Gbps
- Intel Core i5-2500K
- G.SKILL Ripjaws X Series 8GB (2 x 4GB)
- Corsair CMPSU-850HX 850-Watt HX Professional Series 80 Plus Certified Power Supply
- Palit Geforce GTX 560 Ti 2048 MB 256-bit GDDR5 PCI Express 2.0 x 16
- Zalman CNPS9700LED Ultra Quiet Cpu Cooler
- Intel X25M 80 GB Solid State Drive
- Western Digital 640 GB Caviar Black SATA 7200

 

[Johnny Nuge]

I had the same problem early on with my build. Every time I moved something around in the case, the 24 pin and/or 8 pin would come loose. It was really annoying.

 

[GamingRig]

The computer can run for days without a problem, only shutdown twice within 30 minutes of powering it on. It seems that it happens after it was off for a short time.

 

[Subwayeatbig]

That happens to me sometimes with my p67 sabertooth... I have to hold on to power button for a bit for it to start.

 

[GamingRig]

Or just when reconnecting the computer and trying to power it on? Thanks.

 

[SuPrEIVIE]

Perhaps what you are experiencing is sleep mode in Windows that is triggered when an idle countdown has finished. It happened to me on my P8P67 standard just now and i had to hit the reset button and it would actually reboot bios etc just to get to the windows lock down screen. Is sleep mode for the P67 broken?

 

[GamingRig]

The sleep mode works if PLL Voltage is turned off in the Bios. The power issues I'm experiencing are not due to Windows, since it happens sporadically when I work on the computer moving things around or doing cable management or move it to another room and then trying to reconnect and power on, but the computer will not power on, unless I unplug/replug the 24 pin power connector.

Would a power supply tester give me good indication, whether the voltage supply is consistent or not, such as the "Easy Accurate Pc Power Tester for Atx 20/24PIN Power Supply"

http://www.amazon.com/Accurate-Power...1887779&sr=8-1

Thanks.

 

[GamingRig]

Thank you all for your help.

Just wanted to get back with a solution, in case somebody views this thread in the archive.

I ordered an Antec power supply tester and requested advance RMA for the power supply from Amazon (since it was still within the time frame of the first 30 days).

The tester showed similar good voltage values on all cables on both power supplies. I decided to install the new power supply anyway, and it has been working flawlessly for the past two weeks.

I also tested it extensively on several occasions with multiple power on/off to see whether moving the computer to another location, performing cable management or any other computer management tasks would cause the problem to reappear, and it has not.

So it was the brand new Corsair 850HX power supply after all, which caused these intermittent power problems.

 

[bankster55]

I have been noticing these posts myself about people having to reinsert their 24 pin connector or push it towards one side to get the PC to boot - which is ridiculous.
So my theory is that either the male pins on the mobo connector are slightly smaller, or the PSU connector split females are slightly too large or weak.

Thnx for update, good info.