PC randomly not turning on w/ power button

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Mythical_Tort

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May 20, 2013
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10,510
My friend and I built my PC and were extremely cautious with the components. (We just built his about two weeks ago and everything is working perfectly) We installed the correct software, did a test boot, etc. General PC building precautions and preparations.

My specifications are as follows:
- Intel i5-3570k
- EVGA 660ti FTW+
- Corsair Vengeance DDR3 1600Mhz (2x4GB)
- ASrock Z77 Extreme 4-M
- Seasonic M12 II Bronze Modular 750W PSU
- 2 TB 7200 RPM Hitachi HDD, Blu-Ray Optical Drive, Corsair SP120 fans, etc.
- Corsair 350D case & Windows 7 Home Premium 64-bit

My problem is that it would randomly not turn on

- For a couple days after I built it, it turned on perfectly with the power switch, but after that it started not turning off/on with the switch. 50+ percent of the time it would not turn on. To turn it on, I would have to take off the side panel and short the motherboard power pins. This would consistently work every time. One of my new methods I found just this morning was unplugging the motherboard pwbtn switch and plugging it back in. Then, the power button would work. I've found that time will affect if the power button will work or not. If I shut it down and wait 'til the computer is completely off and then hit the power button within a few minutes of my PC being off, then it will turn on. If I leave it off for a few hours or more, it will refuse to turn on using the power button and I will have take the side panel off, short the motherboard pwbtn, or unplug the motherboard pwr switch and plug it in again and then use the button. This same problem still persists.
I've replaced RAM, PSU, and switched cases since these problems started, and they still continue. I also doubt I've had this many faulty parts.
 
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Mythical_Tort

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May 20, 2013
9
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10,510
I tried this last night and plugged the reset switch plug into where the power switch plug normally goes, left it off for about 10 minutes, turned it on, and that worked successfully. However, I shut it down and woke up 8 hours later, pressed the reset switch and that didn't turn it on. Once again I had to short the motherboard pins to turn it on.
 
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Mythical_Tort

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May 20, 2013
9
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10,510
Indeed, I did use stand-offs when installing the motherboard. Also, when I originally did a test boot, with my motherboard on the box and only necessary components to turn it on, it booted up properly. This of course was outside of the case with only needed components and I obviously shorted the motherboard power pins rather than using the power button.
 
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ram1009

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Jun 28, 2007
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If you can CONSISTENTLY start the computer by shorting the pins on the MB then the problem is somewhere between the pins and the switch itself. You might try spreading the pins out SLIGHTLY to make better contact inside the female receptacles. Be careful because the pins are brittle and will break if bent too far. If that doesn't work you might have a bad crimp where the female sockets are attached to the switch wires. The other end of the wires are either crimped or soldered and there also could be a bad connection there. An ohmeter would be handy in diagnosing this. It would be good if you could get a new switch/wire assembly from the box maker.
 
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Mythical_Tort

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May 20, 2013
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10,510
I thought it was a bad case ( I had some cheap cooler master case ) so I got the Corsair 350D. I was sure that it was the case but, now that I have installed all components in my 350D it still has the same problem, so it's not the case. All of the pc building guides I had watched did a test boot on their motherboard box, which is what I did. I'll try messing with the pins a bit to see what happens.
 
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Mythical_Tort

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May 20, 2013
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10,510
I have actually changed the ram and switched it's positions, as well as ordered new corsair vengeance ram, that still didn't fix it. I don't see any bent pins. I don't even know what an ohmeter is, or why I would need one. But, let me tell ya, the power button does work, but only if my computer is off for a few minutes. 30+ of being off and I'll have to short the mb pins, I find that particularly peculiar.
 
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