Asus Z87i-Pro keeps switching itself on since re-install of Windows 8

Guest · May 17, 2014

Hi,

I have owned this PC for the last 10 months' or so, with the following parts:

CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor
CPU Cooler: Cooler Master Seidon 120M 86.2 CFM Liquid CPU Cooler
Motherboard: Asus Z87I-Pro Mini-ITX Mini ITX LGA1150 Motherboard
Memory: G.Skill Ares Series 8GB (2 x 4GB) DDR3-1866 Memory
Storage: Crucial M4 128GB 2.5" Solid State Disk
Storage: Western Digital Scorpio Blue 640GB 2.5" 5400RPM Internal Hard Drive
Video Card: EVGA GeForce GTX 760 2GB Video Card
Case Fan: Scythe Gentle Typhoon 57.7 CFM 120mm Fan
PSU: Silverstone 450watt SFX power supply
Case: Silverstone Sugo SG05 LITE

Since a recent re-install of Windows 8, shutting the PC down seems to work temporarily, and then any time between a minute and twenty minutes after the PC shuts down, it starts up again.

I have made no changes to the BIOS configuration since re-installing Windows.

I have checked the manual, cleared the CMOS, checked to see if WOL or anything odd is enabled in BIOS and can't find any thing obvious.

Does anybody have any idea? Could it be PSU related, or is it likely to be a MB fault?

bgunner · May 17, 2014

possible bad power switch on the case. it you are actually powering all the way down it is a hardware issue.

if you are putting it to sleep then there is a setting in the bios to allow the Ethernet card to wake the PC. this will cause this.

Guest · May 17, 2014

bgunner :

As far as I can see it's powering down.

If it was a faulty power switch it would be randomly shutting down too, I guess.

I can't find a specific WOL setting in the BIOS but this has never happened before (in the ten months of owning the PC). The only two changes that could possibly be affecting (other than something being broken) are a re-install of Windows 8 and an update of the BIOS firmware (which I have since rolled back).

bgunner · May 17, 2014

I know this is going to sound a little odd but I will explain. try after or even just before powering down the system, removing the Ethernet cable. The reason for doing this is to test if the network card is causing the PC to turn back on. If it does not turn back on after this you know where the issue is BUT if it does turn back on it rules out the network card.

Guest · May 17, 2014

bgunner :

The problem is there is no ethernet cable attached, just the inbuilt wifi, and the wifi stack isn't enabled from bios (so I assume WOL wouldn't work anyway)

bgunner · May 17, 2014

WOL is only supposed to work with the system in sleep mode, hence the wake part of the name. Once powered off, the only way to restart the system is the power button or the 2 pins the power button connects to. This is why I suggested the power button.

be sure you are shutting down the PC and not putting it to sleep, hibernate or hybrid sleep.

Guest · May 20, 2014

Since I posted this the SSD in the system has become completely unreadable.

Could it be that a faulty SSD was causing the odd power behaviour?

bgunner · May 20, 2014

I suppose it could if the OS was not shutting down properly But it is a long shot. If you can do a secure erase on the SSD, try reinstalling windows again and see if the problem persists. I have a real hard time believing a bad HDD/SSD would cause this on its own with out an OS issue.

Guest · May 22, 2014

OK,

I think I have narrowed down the issue, and it relates to "Hybrid Shutdown/Fast Startup" on Windows 8.

The reason I think I never noticed this on my previous W8 install was that I was using Start8 from Stardock, which must have implemented a full shutdown from the Start Menu.

On the recent reinstall I have just been using "vanilla"W8. I reinstalled W8 *again* a couple of days ago and the problem persisted, but since disabling fast startup seems to have stopped it.

The problem is, this doesn't fix the underlying issue, in that it seems the mobo is incompatible with the new shutdown process implimented in W8. Any idea where I go from here? Or do I just give up and call it a day?

bgunner · May 22, 2014

OK I found some info on the hybrid shutdown that should give you more knowledge on how it works. http://www.techsupportalert.com/freeware-forum/system/12944-method-of-shutdown-in-windows-8-1-makes-difference.html

Since I am still learning Win 8 myself I can't help much more on this. I suggest you make another thread naming this exact issue.

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