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Power supply question - compy_noob - 10-22-2011

So, I'm building a Tier 1 gaming pc as seen on this site.

I did modify a couple of things - upgraded the hard drive to the Tier 2, 1 TB hard drive and upgraded the motherboard to the future-proof-sounding ASRock Z68 Extreme3 Gen3 LGA 1155 SATA6Gb/s USB3.0 (the INTEL alternative given in the article).

Aaanyways. I installed the CPU, RAM and video card and plugged the motherboard into the power supply so that I could try a boot. No dice. The motherboard has a handy on / off button, but no fans come on, nothing.

Here's what's plugged in -

Power supply -> outlet
Motherboard -> Power supply (via 24 pin ATX)
Video card -> Power supply (via the PCI E -labeled cable)
Top fan of the case -> Power supply


Nothing turns on or spins.

I'm going to grab a voltmeter from school and see if anything is coming off of the power supply. I think I just have a dud. Any other ideas?

Thanks in advance!
Also, while I am a newbie, I did flip the switch on the back of the power supply ;-)


RE: Power supply question - Andrew J - 10-22-2011

Try shorting the purple wire with one of the black ones using a wire or paper clip (all the black ones are grounds) on the 24 pin connector of the power supply. This is essentially what happens when you press the power button. If the fan does not spin up it's defective.


RE: Power supply question - compy_noob - 10-22-2011

(10-22-2011, 10:05 AM)Andrew J Wrote: Try shorting the purple wire with one of the black ones using a wire or paper clip (all the black ones are grounds) on the 24 pin connector of the power supply. This is essentially what happens when you press the power button. If the fan does not spin up it's defective.

Thanks! I'll try that when I get back home.


RE: Power supply question - Andrew J - 10-22-2011

Oh and make sure the power button on the back of the power supply is in the On (1) position.


RE: Power supply question - MathieuB - 10-22-2011

(10-22-2011, 09:38 AM)compy_noob Wrote: Here's what's plugged in -

Power supply -> outlet
Motherboard -> Power supply (via 24 pin ATX)
Video card -> Power supply (via the PCI E -labeled cable)
Top fan of the case -> Power supply

Sounds like you forgot to connect the 4 or 8 pins 12V power connector that connects to the motherboard, close to the CPU socket. As well as connect SATA power connectors to the hard drive and optical drive.

You also want to make sure that you've connected the front panel connectors, such as Power, Reset, HDD LED and the like.


RE: Power supply question - compy_noob - 10-22-2011

(10-22-2011, 03:21 PM)MathieuB Wrote:
(10-22-2011, 09:38 AM)compy_noob Wrote: Here's what's plugged in -

Power supply -> outlet
Motherboard -> Power supply (via 24 pin ATX)
Video card -> Power supply (via the PCI E -labeled cable)
Top fan of the case -> Power supply

Sounds like you forgot to connect the 4 or 8 pins 12V power connector that connects to the motherboard, close to the CPU socket. As well as connect SATA power connectors to the hard drive and optical drive.

You also want to make sure that you've connected the front panel connectors, such as Power, Reset, HDD LED and the like.

I haven't installed the hard drive or optical drive yet, just wanted to do a quick check that the power supply & motherboard were okay. I definitely forgot the 4-pin guy, thanks.

I shorted the Purple cable and the Black cable on the 24-pin ATX from the power supply and the fan on the power supply didn't turn on. I swear I saw a little spark though.

EDIT - I also noticed that one of the pin spaces on the 24-pin ATX was empty. Does that matter?


RE: Power supply question - MathieuB - 10-22-2011

(10-22-2011, 04:53 PM)compy_noob Wrote:
(10-22-2011, 03:21 PM)MathieuB Wrote:
(10-22-2011, 09:38 AM)compy_noob Wrote: Here's what's plugged in -

Power supply -> outlet
Motherboard -> Power supply (via 24 pin ATX)
Video card -> Power supply (via the PCI E -labeled cable)
Top fan of the case -> Power supply

Sounds like you forgot to connect the 4 or 8 pins 12V power connector that connects to the motherboard, close to the CPU socket. As well as connect SATA power connectors to the hard drive and optical drive.

You also want to make sure that you've connected the front panel connectors, such as Power, Reset, HDD LED and the like.

I shorted the Purple cable and the Black cable on the 24-pin ATX from the power supply and the fan on the power supply didn't turn on. I swear I saw a little spark though.

EDIT - I also noticed that one of the pin spaces on the 24-pin ATX was empty. Does that matter?

Some PSUs won't start without a minimum load. Seeing a spark definitely isn't a good sign.

Yes, one of pins is indeed "missing", that's part of the design.

Have you tried starting the PC with all parts, after plugging in that 4-pin cable?


RE: Power supply question - compy_noob - 10-22-2011

(10-22-2011, 05:16 PM)MathieuB Wrote: Some PSUs won't start without a minimum load. Seeing a spark definitely isn't a good sign.

Yes, one of pins is indeed "missing", that's part of the design.

Have you tried starting the PC with all parts, after plugging in that 4-pin cable?

Well, don't I feel dumb. I have not tried that!

I'll give it a shot! Thanks.




RE: Power supply question - compy_noob - 10-22-2011

Putting more of a load on the PSU totally did the trick! Thanks so much for the help.