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I connected a new 6 pin pci e cable from my modular psu to gpuand pc wont switch on

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  • Power Supplies
  • Components
  • Power Down
  • Cable & Wireless
  • GPUs
  • PCI Express
Last response: in Components
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April 29, 2014 6:59:10 AM

i was running power to r9 270 through to molex connectors with a 6 pin adapter but replaced psu for a tx550m semi modular which came with no 6pin to 6pin for gpu so i continued running on molex to 6pin config but i bought a 6pin to 6pin pci e cable and fitted it today and pc started up but green led on gpu was not on instead had a red one so i paniced abit an cut the power by first trying front panel then pulling the mains lead out the psu now when i try to turn on nothing happens except light under mouse comes on , (first comma lol) ive removed gpu an refitted my original psu a cit 500w and checked psu plug fuse wall socket outlet ,ive checked cpu and 24 pin connections and any oters i remade refitting old psu and i fear the worse but is there anything else i can try before i go out and buy .my set up now is below but when fault started set up was with psu and gpu mentioned above
a10 7850k
8gb x1 1600mhz
asrock fm2a55m-hd+
cit 500w
any help would be great
Thanks

More about : connected pin pci cable modular psu gpuand wont switch

a c 166 ) Power supply
April 29, 2014 11:46:55 AM

If this is your PSU, it should have had 2 x 6+2 pin connectors included: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Or was the PSU used from someone that didn't have all the parts?

What was this "6 pin to 6 pin" PCIe cable you bought; can you provide a link to it or a pic?
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April 29, 2014 12:47:06 PM

clutchc said:
If this is your PSU, it should have had 2 x 6+2 pin connectors included: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Or was the PSU used from someone that didn't have all the parts?

What was this "6 pin to 6 pin" PCIe cable you bought; can you provide a link to it or a pic?


http://www.ebay.co.uk/itm/310880394973?ssPageName=STRK:...
this is the cable i bought
and below is the ad for the psu that i also bought
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a c 166 ) Power supply
April 29, 2014 2:01:45 PM

Do you have any idea if that 6 pin cable was wired the same as your PSU's modular receptacle is?
It looks like you bought a used PSU that didn't have all the parts. If the pic is the one you bought, it has a (home-made?) molex to 6 pin adapter in place of the 2 x 6 pin cables that would have come from Corsair.
Take a voltmeter and check if the yellow wires from the new cable are (+12V) and the black are (-12V) If you have voltage between any of the same color wires, you have a dead short. If you can't get any reading from the cable at all, the PSU is probably shot. And it may have killed the motherboard if you can't get a known-good PSU to start the system.
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April 29, 2014 2:16:58 PM

i did buy a second hand psu with no lead never again i new it was fools gold but couldnt resist the savings or so i thought ive refitted the old psu a cit 500w but nothing happens except mouse light is on ive ordered a new msi a88xm-35 motherboard today and wont be using the lead or the tx550m ill keep using cit 500w and save up for a decent psu thanks for your reply one more thing im curios about is when i was on pc last i was running a benchmark test with hwinfo on and it showed gpu as only using 24.0 wat while gpu in 99 percent use this was when i had gpu connected thru a six pin to 2 molex adapter 24.0 wat seems really low i thought but it worked as good as ever scoring 30 fps on ultra on uniengine i think anyway my point is 24.0 wat gpu power used as monitered by hwinfo64 on ful load running uniengine benchmark hope that make sense seems really low thats all
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a c 166 ) Power supply
April 29, 2014 2:33:16 PM

The R9-270 is a 150W (TDP) card when topped out, which it sounds like it was if it was at 99%. http://www.hwcompare.com/16547/radeon-r9-270/
You may be looking at the GPU VRAM of the card and not the GPU CORE. There are 2 different sections on Hwinfo.
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April 29, 2014 3:04:01 PM

thanks guys btw does 24.0 wat sound like a gpu vram read out ?
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a c 297 ) Power supply
April 29, 2014 3:08:09 PM

Corsair sells replacement cables for the TXM series, the full pack of custom sleeved ones is $80, but they sell individual cables for most of their other line ups, email their support and see if they can sell you a PCI-e cable for the 550TXM
http://www.corsair.com/en-us/professional-individually-...

Odds are the pinout on the spot on the PSU and the PCI-e connector are not straight through, the PCI-e cable has all 12V lines on the top, and all ground lines on the bottom, but if corsair decided to split it left-right because it made routing easier in the PSU a straight through cable won't work, and suddenly they have a market for accessories! I'll try to find a pinout of your PSU to confirm.
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a c 166 ) Power supply
April 29, 2014 3:11:51 PM

jimski53 said:
thanks guys btw does 24.0 wat sound like a gpu vram read out ?


Exactly!
The Antec is a good PSU... if you buy it new.
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April 29, 2014 3:12:30 PM

thanks hunter that would be great what damage do you think i have done by using a straight thru lead when i should of got the correct corsair one ive already ordered a new motherboard but could it have damaged cpu ,gpu ,ram or even the psu itself
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April 29, 2014 3:18:59 PM

thanks grandmaster :) 
knowledge is power and i have none but im learning lol thanks for all the replies i get it know just hope when i fit the new board the cpu and gpu and ram are ok what do you think would this scenerio have stopped at the motherboard or killed the lot
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