Computer sometimes powers down after POST issue

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Psychos85

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Sep 11, 2014
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I have the following issue - a few seconds after turning on the computer, it automatically powers down (after the BIOS POST checks, in a moment when Windows should start booting). Then when I turn it on again, it boots and works normally.
The strange thing is, that this issue happens only from time to time - my feeling is that it happens more often when I turn on the computer in the morning (when the computer is turned off during the night). But also when I turn off and on the computer during the day, it sometimes happen: based on my observations about 2-3 times during 10 power-ons. It has never happened two times in a row (yet).

I have NOT noticed this happening when rebooting the computer, only when powering on.

All the components in the computer are entirely new, I just put them together last week:

Motherboard: GIGABYTE Z97X-Gaming 3 (Bios version updated from F3 to F5)
RAM: Crucial 16GB KIT DDR3 1600MHz CL8 Ballistix Tactical LP (PC3-12800, CL8-8-8-24, 1.35V)
CPU: Intel Core i5-4690K 3.5GHz @3.9GHz (set to 3.9GHz automatically by BIOS) with SCYTHE Ashura cooler
Graphics: GIGABYTE N770OC-2GD
PSU: Corsair RM750
SSD: Samsung 840 EVO Series Basic 250GB
HDD: Seagate Barracuda 7200.14 3000GB
Case: FRACTAL Define R4 Black Pearl
OS: Windows 8.1

My first suspicion was that it could be caused by the RAMs. To explain - I first noticed the issue one day after putting the PC together when changing the default 9-9-9-24 1333Mhz 1.35V setting to XMP profile1 (8-8-8-24 1600Mhz 1.35V). But when doing some tests, the issue also occurs on the default profile (maybe less often? but could be just me feeling). I also tried putting the RAM sticks in different DIMM slots a using only one RAM stick at a time with no change.

Loading the bios optimized defaults also did not help.

When using the fast boot (or ultra fast boot) option in BIOS, the issue also happens from time to time, just the computer gets powered off almost immediately after start.

I am pretty sure that overheating is not an issue here - all the coolers are working fine and the temperatures are good even after hours of gaming.

Any idea what could be the issue? Anything that I could try to troubleshoot it??
 
Solution
clutchc
My bad, too. I failed to notice you were running Win8. That's a new feature that Win7 and previous version didn't have. Good job.
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Psychos85

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Sep 11, 2014
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Thank you for your answer, currently I dont have any other PSU available, however I was just doing some other testing that could maybe point us in a different direction:

I have noticed that the computer is actually powering down a split second after the windows boot screen shows up... this could mean that the issue is right at the beginning of booting (as opposed to the end of POST). Therefore I removed the windows boot loader from the boot sequence and did turn off-turn on sequence about 20 times and the issue did NOT occur (I always got a message to insert a boot medium to DVD drive).
Could this mean that something could be wrong with the Windows boot partition?

Edit: I turned on Boot log from msconfig, however unfortunately there is absolutely nothing logged from the time when the boot fails (computer shuts down). It seems that the booting is interrupted right at the beginning when no log is created yet.
 
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clutchc

clutchc

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I was going to suggest booting to a different OS. The Windows DVD, or safe mode, or another OS if you have one. But since you did essentially the same thing, it appears the PSU isn't the issue. It is as if Windows is giving the shut down command as it loads. Maybe first using your virus pgm's recovery disk, run a FULL virus scan. Or boot to safe mode and run the virus scan after doing the signature updates. Best to eliminate a virus first.
 
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Psychos85

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Sep 11, 2014
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I have scanned the computer multiple times and no viruses were found. As mentioned, the windows installation is just about a week old on a clean disk and antivirus was the first thing that I have installed after OS, so I think it is very unlikely that a virus could be causing this.
Any other ideas worth trying? Is it possible to rebuild the boot partition or temporarily move it to the second disk?
 
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Psychos85

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Sep 11, 2014
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Thanks clutchc for your help, but I just found a solution:
http://answers.microsoft.com/en-us/windows/forum/windows8_1-windows_update/windows-81-pro-hangs-on-every-first-booting-after/263c53d2-f880-46be-928f-c18f4f662160

So basically what needs to be done:
Control Panel > Power Options > Choose what the power buttons do > Uncheck "Turn on fast startup"

I was not aware that also Windows has some "fast boot" option, because previously I was turning on and off the fast boot directly in BIOS and the issue was happening regardless of such BIOS setting. However it seems that this Windows setting is causing some compatibility issues. Turning it off solved the issue - or at least I hope so, after about 20 power down/up cycles the issue did not occur.
 
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