GA-Z87X-OC Issue..Won't whut down

[thepan]

Hello guys,
I Am opening this post after experiencing a very strange issue. the computer always worked fine, but when I have changed the two fans of my H110 the damage happened!
The computer won't shut down anymore, windows closes everything but all inside the case still stays on. This is the second motherboard that does strage things, when I bought the first Z87X-OC I had to send it back because of this issue and they replace it on warranty. Now, after 8 months of usage with no problems at all it does it again. At first look I tought that it might be the case so today I got a new one but the problem is the same. It is very strange, when I press the on button, everything goes on but it doesn't boot....I have to press a second time to make the motherboard do his stuff and check the ports on the display.
To switch it off the only way is to press the I/O on the PSU. Hopefully you guys will give me a solution before send it to RMA!


Sys spec:
GA-Z87X-OC Bios ver: F8 (latest before beta)
i7 4770k with H110
Corsair dominator GT 8gb 2133
Gigabyte gtx 980 g1 gaming
SSD Toshiba Q 256gb
HDD Caviar green 500
SuperFlowe Gold 850
Carbide Air 540
win 8.1 pro 64bit

Thank you in advance for all your help!

 

[Mrjobby]

Sounds like the stupid OC Ignition switch...

Have you pressed that button on the back of the board by any chance?

 

[OLDPHART]

Just press your case Power ON button hold it in till it powers down

 

[thepan]

Just press your case Power ON button hold it in till it powers down

Well, yes, I'm not that noob

 

[thepan]

Sounds like the stupid OC Ignition switch...

Have you pressed that button on the back of the board by any chance?

Yes, I've tried but it won't work.... now is on RMA, thank for the fast response. Anyway clearing the Cmos (especially removing battery for some mins) should put the OC Ignition off automatically, I also have changed bios a couple of time before calling OcUK, tied different PSU, RAM, VGA (in all slots) and SSD/HDD (plugged/unplugged), tested if the motherboard got enough juice from the PSU, paper clip tested on the PSU... I was out of ideas and the RMA seemed to be the only way...

P.S. Sorry for my terrible grammar but I come from aboard