New Build Won't Post

[nwolf1010]

I recently built a new PC for my freind, the build went smoothly and every thing seemed fine but when I plugged it in to see if it would post it hair turns on for a split second then instantly turns off. Everything turns on the fans and the lights but turns off after a split second. I tryed testing the psu, I tried one ram stick at the time, I tried booting it with just the bare minimum plug into it, it still dident boot. I think at this point that is may be a bad mobo. What do you guys think?

Here is the build

PCPartPicker part list: https://pcpartpicker.com/list/yKtJKZ
Price breakdown by merchant: https://pcpartpicker.com/list/yKtJKZ/by_merchant/

CPU: Intel - Core i5-7500 3.4GHz Quad-Core Processor ($197.68 @ OutletPC)
Motherboard: Gigabyte - GA-B250M-D3H Micro ATX LGA1151 Motherboard ($79.99 @ SuperBiiz)
Memory: G.Skill - Ripjaws V Series 16GB (2 x 8GB) DDR4-2666 Memory ($144.99 @ Amazon)
Storage: Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($66.89 @ OutletPC)
Video Card: NVIDIA - GeForce GTX 1080 8GB Founders Edition Video Card ($549.99 @ Best Buy)
Case: Corsair - Air 240 MicroATX Mid Tower Case ($79.99 @ Newegg)
Power Supply: EVGA - 500W 80+ Bronze Certified ATX Power Supply ($45.77 @ OutletPC)
Wireless Network Adapter: TP-Link - TL-WN881ND PCI-Express x1 802.11b/g/n Wi-Fi Adapter ($17.78 @ Amazon)
Case Fan: Corsair - HD120 RGB 54.4 CFM 120mm Fan ($26.61 @ OutletPC)
Monitor: AOC - G2460VQ6 24.0" 1920x1080 75Hz Monitor ($149.98 @ B&H)
Keyboard: Corsair - K95 RGB PLATINUM Wired Gaming Keyboard ($199.99 @ Amazon)
Mouse: SteelSeries - Rival 300 Wired Optical Mouse ($49.99 @ Best Buy)
Total: $1609.65
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-09-07 07:42 EDT-0400

 

[gdmaclew]

I had that happen to me once. It was a faulty PSU.
Doesn't matter if it is a good brand or not.

 

[nwolf1010]

I had that happen to me once. It was a faulty PSU.
Doesn't matter if it is a good brand or not.

I already tested the psu with the paper clip test

 

[gdmaclew]

You may have done the "Paper clip test" but that only determines if the PSU will turn on or not.
The problem with my PSU (and it may not be the problem with yours) was the PWR_OK line was faulty (Pin # 8). The paper clip test will not test this.
My system would turn on like yours for less than a second and the motherboard was not getting a PWR_OK signal and promptly shut down. It's there for just that reason.

I sent it back and they sent me a new identical one. Fixed the problem. It was a Corsair RM-750.

See the diagram below...

http://www.smpspowersupply.com/connectors-pinouts.html

 

[nwolf1010]

You may have done the "Paper clip test" but that only determines if the PSU will turn on or not.
The problem with my PSU (and it may not be the problem with yours) was the PWR_OK line was faulty (Pin # 8). The paper clip test will not test this.
My system would turn on like yours for less than a second and the motherboard was not getting a PWR_OK signal and promptly shut down. It's there for just that reason.

I sent it back and they sent me a new identical one. Fixed the problem. It was a Corsair RM-750.

See the diagram below...

http://www.smpspowersupply.com/connectors-pinouts.html

i have tried swaping out the psu with one i know to work and i am still having the same issue, any ideas?

 

[gdmaclew]

You have checked all motherboard connectors?

 

[nwolf1010]

You have checked all motherboard connectors?

yeah i have

 

[gdmaclew]

Including the 4-pin or 8-pin motherboard CPU Power connector?