Asrock Z170 Pro4S Boot Issue

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   I have the exact same problem.  I've read about other Z170 motherboards have an issue like this being linked to a DirectKey functionality.  
Reboot works just fine, but using Shutdown in Windows 10 causes the problem.  The case fans will spin, bu but the CPU fan never starts.  After turning off the power supply and counting to 10, I turn on the power supply and the system automatically boots(no power button pressed).

Using ASRock Z170 PRO4S

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tharing Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 26 Mar 2016 Status: Offline Points: 1	Post Options Post Reply Quote tharing Report Post Thanks(0) Quote Reply Topic: Asrock Z170 Pro4S Boot Issue Posted: 26 Mar 2016 at 10:00pm
	I have the exact same problem. I've read about other Z170 motherboards have an issue like this being linked to a DirectKey functionality. Reboot works just fine, but using Shutdown in Windows 10 causes the problem. The case fans will spin, bu but the CPU fan never starts. After turning off the power supply and counting to 10, I turn on the power supply and the system automatically boots(no power button pressed). Using ASRock Z170 PRO4S

chrisk2305 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 25 Feb 2016 Status: Offline Points: 18	Post Options Post Reply Quote chrisk2305 Report Post Thanks(0) Quote Reply Posted: 25 Feb 2016 at 1:52am
	Hi Guys, hope you can help, have been troubleshooting this for over a week now. Once I turn off the PC via Windows or do a BIOS Update the System won't post. Only after switching the PSU off and on again the System boots normal. Once in Windows everything is working fine. I can even reboot the system. But once i shut it down i cannot get the system to post anymore. Specs: Intel Core i7 6700K 16 GB Kingston HyperX Fury DIMM Kit 16GB, DDR4-2666, CL15-17-17 ASRock Z170 Pro4S (Bios P 3.0) Corsair VS 650W PSU Asus R9 290X Sandisk X300s 500GB SSD I tried downgrading to 2.70 Bios, resetted CMOS via Jumper and UEFI. Put memory in different slots - but no avail. System just wont post if I power it down normally. Only turning the PSU completely off lets the system post. What is wrong here? Any help is much appreciated. Thanks, Christian