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I ran into a problem - I can't start my new system at all: when Power Switch is pressed nothing is hapenning, even cpu/system fans are not moving for a split second.

And I just was at the shop where I had bought everything - they started it without any problems, might I say they used their own PSU - I'm reusing mine from the previous build and it's functioning well - I just got back to my old mobo+cpu and everything is ok.

Specs:

  • Motherboard: Gigabyte Z97P-D3 (in manual it says it requires at least 500W, my PSU has 550 and is certified as gold 80+)
  • CPU: Intel i5-4690K
  • PSU: Seasonic SSP-550RT
  • RAM: 2x8Gb Kingston 1600Mhz Red Fury
  • Video: ZOTAC GeForce GTX 660 2Gb DDR5 AMP! Edition

I guess other specs are irrelevant (two fans, 1 ssd and hdd, video). I even tried disconnecting video card power - didn't help.

I also tried reseating ATX and ATX 12V (there are 2x12V connectors/cables on mobo and PSU), flipped around the power switch pin connector - even tried touching pins with a metal screwdriver - the system doesn't respond at all. I'm baffled, does anyone have a suggestion? Thank you.

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  • You say you disconnected your video card power yet you don't list a GPU in your specifications.
    – Ramhound
    Commented Nov 14, 2014 at 16:00
  • Sure, added a video spec.
    – kK-Storm
    Commented Nov 14, 2014 at 16:12
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    Go back to the shop and leave with a working pc?
    – DavidPostill ♦
    Commented Nov 14, 2014 at 16:17
  • @DavidPostill thanks, but that would be the final stage. Too easy :)
    – kK-Storm
    Commented Nov 14, 2014 at 16:33
  • Given that the GTX 660 itself requires at least a 500W power supply I don't see how you are supplying enough power to your system.
    – Ramhound
    Commented Nov 14, 2014 at 17:17

1 Answer 1

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As it was said numerous times - the issue had nothing to do with PSU not having enough power capacity to power on the system.

This was kinda strange - apparently when I connected some unknown connecter (I have 4 fans in chassis, so there are loads of cabling), which I assumed was one of the fans, to sys_fan_2 pins, the system couldn't be started (even with me shortening the power pins with a screwdriver). So I just left out this sys_fan_2 and everything is OK. I'd guess that connector being connected created some sort of power loop and prevented system from booting, who knows.

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  • We have an Asrock Motherboard that when a powered USB hub is connected sometimes the computer will not boot. We disconnect the power from the hub and all boots perfectly. Points is there are lots of incompatibilities and "bugs" that exist. The hard part is tracking them down sometimes!
    – Damon
    Commented Nov 14, 2014 at 20:48

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