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PC power and Cooling PSU /w 19pin MB connector!!!

Last response: in Components
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May 31, 2012 4:47:28 PM

I assembled a new PC last week.
-Corsair 500R
-PC power and cooling silencer MKII 750W
-Gigabyte Z77x UD5H
- i2700k
- gtx 670 evga
- Mushkin enhanced redline 1866
- Noctua NHD-14
- OCZ vertex 4

- Everything was running smooth until yesterday (CPU OC'd to 4.5GHz (Max temp under stress 65C, GPU OC'd to 1200, max load 67C). Here is the funny thing, I got my HD (TB, WD caviar black, 7200, 6GBs) only yesterday evening, so I hooked it up, now the PC don't turn on. There was no beep no LEDs blinking. Next thing was to check the power supply, I did the paper clip trick and it turned out the Power supply was OK.

- It took hours though eventually I figured that there is something with the motherboard power connector (20+4 pin), seemed like loose contact. Needless to say, it wasn't just any loose contact but the 20 PIN was missing 1 pin all together!!!!!!!!! there were only 19 pins.

- Now I don't understand this. if the connector is missing 1-pin, how did the computer functioned until now? Do you think think might have damaged any of my hardware components on-board? Please provide me a detailed insight to this. I am worried if I have compromised the whole rig. May be I am just paranoid, idk.

- As it is evident, is definitely the POOR :fou:  quality control from PC power and Cooling, if this indeed damaged any of my components can I file a claim?

- I am getting a refund from Amazon, also ordered a Corsair HX Professional Series 850-Watt 80 Plus Certified Power Supply Compatible with Core i7 and Core i5 - CMPSU-850HX.

I look forward to your comments, thanks in advance.
May 31, 2012 6:28:12 PM

I'd check to see if it is inside the motherboard's input, and then i'd count the wires on the cable to see if it slipped out of its plastic pin housing.
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May 31, 2012 6:35:42 PM

iraserei said:
I'd check to see if it is inside the motherboard's input, and then i'd count the wires on the cable to see if it slipped out of its plastic pin housing.


I checked this, cable And the pin are missing. There are only 19 wires.
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May 31, 2012 6:37:43 PM

Hmm,interesting, Is the Power Supply Modular or are the cables hardwired to it?
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Best solution

a c 76 ) Power supply
May 31, 2012 7:19:32 PM

llubbull said:
I checked this, cable And the pin are missing. There are only 19 wires.


It's missing the -5V pin/wire and it's not a problem (only needed for VERY old peripherals). NO newer PSU's have one. The problem doesn't lie there, trust me.

Take a look and note the missing pin.



If you tried to file a claim for that, they would just laugh at you. Not saying there may not have been something wrong, but I promise you that the "missing" pin/wire wasn't it.
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a c 144 ) Power supply
May 31, 2012 7:25:16 PM

That missing pin is not the problem. Look at any modern PSU. If the missing pin is between a red and a black wire, it used to be a white wire carrying -5 volts.

ATX 2.01 specification in 2004 removed the requirements for the -5 volt output. The missing line is not causing your problem.
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a b ) Power supply
May 31, 2012 7:27:26 PM

but now he can't complain bitterly and want compensation
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May 31, 2012 7:44:30 PM

Aaah thats right, I forgot about that.
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May 31, 2012 7:56:07 PM

DJDeCiBeL said:
It's missing the -5V pin/wire and it's not a problem (only needed for VERY old peripherals). NO newer PSU's have one. The problem doesn't lie there, trust me.

Take a look and note the missing pin.

http://www.playtool.com/pages/psuconnectors/all20plus4.jpg

If you tried to file a claim for that, they would just laugh at you. Not saying there may not have been something wrong, but I promise you that the "missing" pin/wire wasn't it.



Thanks for clarifying that part, which obviously I wasn't aware of, neither did the booklet came with the unit.

In any case the problem doesn't go away, the moment I touch the mobo power connector the system goes down. So, got to be something else with the connector, any ideas?
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a b ) Power supply
May 31, 2012 7:58:49 PM

I'd be checking the power switch and associated wiring/connection to the motherbd.
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a c 76 ) Power supply
May 31, 2012 8:01:01 PM

I really don't know, honestly. If the connector is seated well, it shouldn't do that. It's probably in the wiring somewhere though.
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May 31, 2012 8:36:48 PM

Either try to see if the company offers an extra 20pin power connector, or send it back in for replacement.
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June 1, 2012 10:25:47 PM

iraserei said:
Either try to see if the company offers an extra 20pin power connector, or send it back in for replacement.


I am getting a refund for this from Amazon, before that I will swap it with the Corsair HX850, which will arrive today. I will post the results tomorrow. Fingers crossed.
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June 6, 2012 9:29:19 PM

Thanks for your help everyone.

I swapped out the PSU with corsair HX850, everythings looking stable now. :) 
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June 6, 2012 9:29:35 PM

Best answer selected by llubbull.
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a c 76 ) Power supply
June 6, 2012 9:31:33 PM

Good to hear! :) 
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