issue: computer "pauses" on turn on, as if brief power outage

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bombardior

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Jul 12, 2010
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I just built a PC and I think I have everything correctly installed and working except one tiny issue....... When I press the power button on my case to turn on the computer, things make sounds, power up, fans spin...... For like half a second, then, as if power has been cut out in my room, dead silence, all tower lights turn off and all fans stop spinning........ Then, after maybe 2 more seconds, everything automatically turn on again and power on all normally and boots to windows, without any additional input from me, nor additional problems!!! This only happens from a "dead" power on, meaning if I restart the computer, it doesn't have that "pause" phase.

With my limited knowledge, I'm guessing this is either an issue of capacitor needing to be charged up for a bit? Or I may have plugged those little grid/pins in wrong (the ones with power reset hdd led).
Does anyone know what else may cause this error?

edit: relevant parts. running a DVD drive, SSD and HDD in addition to this... nothing I think that would drive this over the edge in terms of power consumption.

ASRock Z97 Pro4 LGA 1150 Intel Z97 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard

SeaSonic S12II 620 Bronze 620W ATX12V V2.3 / EPS 12V V2.91 80 PLUS BRONZE Certified Active PFC Power Supply

Cooler Master HAF 922 - High Air Flow Mid Tower Computer Case with USB 3.0 and All-Black Interior

Gigabyte GTX 760 GDDR5-2GB 2xDVI/HDMI/DP OC WINDFORCE 3X Graphics Cards GV-N760OC-2GD REV2.0
 

OneLapDown

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Jul 30, 2014
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I am running into the same problem, however, my system did not always do this. It just started happening a couple of days ago. Try taking the CMOS battery out for 5 minutes, put it back in and power up. Does it do the same ON/OFF/ON process? Or does it just turn on and stay on? Also, when everything turns off, is there a Start button or a Reset button on the motherboard that stays lit? Hopefully for you, Shaun o is correct, and this is just a self test, but if it exhibits different behavior after the CMOS battery is out for some time, I'm not sure it is a self test. The reason I suggest this is that my board acts differently after the CMOS battery is out, it starts right up and stays on. It is an ASUS, so your ASRock may be different in that regard, as well.
 

FeniksOgnia

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Aug 18, 2014
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I have the same problem right know. I build my PC 5 days ago, and it does the same, turn on, turn off for 2-3 seconds and turn on working perfectly fine.

It is normal and shouldn't worry?
 

OneLapDown

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What motherboard do you have? If it is an ASUS RoG motherboard, ad the second boot only happens after you have cut off standby power, my understanding is this is normal. I am not sure about other manufacturers, unfortunately.
 

Dan414

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Dec 24, 2014
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Having the same issue here, and I still haven't figured out why. It's alarming, though, when the computer seems to start up then goes blank after a 1/2 second. Two seconds later, it will start-up like normal, but my heart doesn't beat in the interim.
 

pcJedi

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Aug 27, 2015
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I'm also having this issue. Running the same motherboard, and having no other problems. To add to the information base, I did change out my PSU from a Corsair AX750 (refurbished... poorly) to a CX600M (brand new) and still have the problem. The first PSU died on me after two weeks. Not sure if that was due to the repeated power up, then off, then normal boot. I've been running the new PSU for a week, but I would really like to confirm that this is normal and not causing any issues or adversely affecting any of my components.

Has anyone with this issue tried a BIOS update? I'm a little wary to do so...
 

Dan414

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Dec 24, 2014
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So... my problem went away. I'm not sure why. I've switched to Win 10 (should have nothing to do with it, right?) and upgraded from a GTC 760 to a 970. Previously I tried swapping out CX600M's but that didn't change anything.... I get no hesitation from soft or hard boots (kicking the plug out for a min).

Sorry this is not very helpful.
 

pcJedi

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I'm running similar hardware to what has been discussed here (CX600M and ASRock z97 Pro4), so I'm thinking its just some odd BIOS setting, a strange component issue, or "the motherboard performing a self-check". Either way, I'm running Windows 10 as well and it is booting smoothly if I don't remove the power completely from the PSU. It's an acceptable work-around for now. As long as everything continues running, I will just forget about it... until the power goes out and it does this boot pause, and I have an aneurism thinking that something has been fried.
 
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