Event ID 1074 - Random and unsolicited system shutdown.

I'm currently working between several help forums and my motherboard manufacturer's technical support to solve an abhorrent behavior of my Windows 7 x64 desktop. The issue begins with a clean shutdown, completely at random, without my consent and definitely against my will. Try as I might this process cannot be stopped. Clicking the "Cancel Shutdown" button that appears as it tries taking out the slower-closing processes only prolongs the inevitable in this process. Once this is complete, on occassion the system will attempt to restart on its own moments after the shutdown, and will fail. Sometimes it will skip that, and simply go to the next phase of this concerning issue, which is an unresponsive state. The system will not respond to either the power button on my case, or the button embedded onto the motherboard for just such situations. The only method by which to then turn the computer back on involves unplugging and switching off the PSU of my computer until an LED on the board which indicates current is present in it shuts off. After which I may immediately replug the system back in, and it will then function appropriately for months at a time. The issue is massively sporadic in nature and does not necessarily contain any common ground as far as I can discern. It will occur during light web browsing, during gaming, and even while unattended. My system has been stress-tested, memory checked, voltage metered, and temp monitored rigorously to no avail. It is not over-clocked. I understand the scope of this forum does not likely extend beyond the scope of software, so my expectations of solution are narrowed to merely hoping that I might be given some support on how I might identify what, if any, hardware or components in my system would be calling for a system shutdown in this manner? Within the logs I'm familiar with using, the only potentious bit standing out is a log from a recent incident where I attempted to stop it so as to save something I was working on before it shut down. This is the log from event viewer:

"The process C:\Windows\system32\winlogon.exe (TAQUITO) has initiated the power off of computer TAQUITO on behalf of user Taquito\MasterDXL for the following reason: No title for this reason could be found

 Reason Code: 0x500ff

 Shutdown Type: power off

 Comment: "

I'll also quote my hardware configuration from my post in the motherboard manufacturer's forums for reference, in the event there are some known software compatibility issues with any of the devices I'm running with that might bear some culpability for this. Ultimately I just want to find what component is responsible for this so that I can have it replaced/repaired if possible, because I feel it is likely some ACPI command being sent by something faulty in the system, be it driver-level or otherwise. Any help would be greatly appreciated!

"This is my setup, I'm including all my peripherals and supplying product links where possible for the purposes of some perhaps known (unknown to me) inter-compatibility issues amongst them: 
EVGA 780i SLI - BIOS vers. P10 (issue occurred on P08 and P06 as well) http://www.newegg.com/Product/Product.aspx?Item=N82E16813188024 
EVGA nVidia GeForce GTX 260 core 216 (pre-45nm shrink) http://www.newegg.com/Product/Product.aspx?Item=N82E16814130398 (Issue has occured with every driver revision available since release, I update on a cycle of every single new release, including betas) 
G.Skill 2x2GB DDR2 800  
Antec Neopower 650W http://www.newegg.com/Product/Product.aspx?Item=N82E16817371010 
Intel Core 2 Quad Q6600 G0 Stepping http://www.newegg.com/Product/Product.aspx?Item=N82E16819115017 
LG Super Multi Blue BD-RW drive http://www.newegg.com/Product/Product.aspx?Item=N82E16827136137 
2x WD Caviar Black 640GB (Raid 0) http://www.newegg.com/Product/Product.aspx?Item=N82E16822136319 
1x WD Caviar Blue 320GB  
1x WD Caviar Blue 640GB http://www.newegg.com/Product/Product.aspx?Item=N82E16822136218 
CM Cosmos S chassis http://www.newegg.com/Product/Product.aspx?Item=N82E16811119150 
Logitech G15 rev2 
Logitech G9x 
APC Back-UPS XS 1500 (Not connected to PC via USB for auto-shutdown feature, purchased because of this issue, thinking it was due to unreliable/"unclean" power) 
Dell U2410 Monitor 
Windows 7 x64 Ultimate "

 

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Last updated January 18, 2020 Views 22,851 Applies to:
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Actually, the first time it happened was the day I fixed that setting, suspecting just that given the unique nature of the power button on my case. So unfortunately it's not as simple as that. However, I do believe it is in the correct general direction. Fielding answers from people on multiple forums brought to my attention that it was not uncommon for there to be a short on the 24 pin extension cable that is necessary for using the power button on my particular case (Cooler Master Cosmos S.) This extension carries the power to the motherboard, and it is in fact also what the power button utilizes for its functions, rather than being connected to the pins on the motherboard in a more traditional case. I haven't yet verified it, but theoretically it seems most likely to be my issue. 

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