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Computer fails to boot once in a while, fixed by resetting CMOS, but problem keeps reoccurring

###Troubleshooting Help:

 

PCPartPicker part list / Price breakdown by merchant

 

CPU: Intel Core i7-6700 3.4GHz Quad-Core Processor  ($301.99 @ SuperBiiz) 
CPU Cooler: Deepcool CAPTAIN 240 91.1 CFM Liquid CPU Cooler  ($79.99 @ B&H) 
Motherboard: Asus H170M-PLUS Micro ATX LGA1151 Motherboard 
Memory: Kingston ValueRAM 16GB (2 x 8GB) DDR4-2133 Memory  ($64.99 @ Newegg) 
Storage: Kingston SSDNow V300 Series 120GB 2.5" Solid State Drive  ($42.30 @ Amazon) 
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive  ($45.89 @ OutletPC) 
Video Card: Asus GeForce GTX 970 4GB Video Card  ($308.00 @ Amazon) 
Case: Corsair Air 240 MicroATX Mid Tower Case  ($67.99 @ Amazon) 
Power Supply: Super Flower Golden Green HX 550W 80+ Gold Certified ATX Power Supply 
Operating System: Microsoft Windows 10 Home OEM (64-bit)  ($85.99 @ Amazon) 
Other: Deepcool RGB LED Kit with remote 
Total: $997.14
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-04-23 06:51 EDT-0400

 

**Describe your problem. List any error messages and symptoms. Be descriptive.**

 

The above computer was built by me for a friend. When first built, the computer worked for about a month or so. Without additional hardware being installed/software changes, my friend called me up to tell me that a particular problem began to exhibit, and I shall describe it below:

 

The above-mentioned computer occasionally is unable to power on; when the wall power connector is connected to the power supply, and the power supply is turned on, a white LED appears on the graphics card (ASUS Turbo GTX 970), signalling that the system has power. However, pressing the power button does NOTHING. There is no fan spinning, no LED lighting. It's as though the power button was disconnected. Attempting to short the power connector header on the motherboard does nothing as well.

 

At his place, we first tried to re-sit the RAM, disconnect and reconnect all the power connectors, and then reset the CMOS by removing the CMOS battery. The computer managed to boot normally after removal and replacement of CMOS battery. We have since replaced the CMOS battery with a new one.

 

However, the problem would reoccur after a while, and it would be fixed by removing and resitting the CMOS battery. Deciding it was odd, we sent the motherboard in for RMA and got a new board. After changing the motherboard, the computer boots and works normally, but the solution seemed to be transient - the problem reoccurred.

 

Thinking it may have to do with the PSU being unable to hold charge, we have also sent the PSU in for RMA, and got a replacement PSU. This time, I took it back to my place for "extended testing" which involved putting it through Novabench, Unigine Heaven, playing Rocket League and GTA V on it and shutting it down/turning it on for about a week. While at my place, it exhibited no problems at all. So, after about a week at my place, we agreed it was safe to bring it back to his place, and so we did, and it booted normally at his place.

 

Guess what? A day after bringing it back, the problem reoccurred. When the power button is pressed, the computer would be unable to power on - the fans would not spin, and the LED lighting does not turn on. However, the white LED on the GPU is still lit, indicating that there is power being supplied to the GPU and it is "ready to be turned on".

 

Something along the lines of: http://i.imgur.com/XIqSZ3n.jpg

 

I'm at a loss, anyone have any idea what's going on?
 

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