NEW Skylake PC Reboot Trouble

Robert_7

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Sep 8, 2015
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Major issue with newly built PC any help appreciated!
Hi built a new PC and it worked fine till a few days ago when it would not Power Down or Power On correctly. I have taken a ton of steps to narrow down the problem and it now powers down correctly but it requires a Hard Reset on the PSU after shutdown to restart, thinking there may be a short and not wanting to wait forever for an RMA or frying the rest of my components I need some advice..

Initially the PC would not shut down fully.. the fans would power down to low and the LEDs on the motherboard and GPU would stay on.. this seems to have gone away and now I have issues rebooting.

I have done the Following to isolate and find the exact issue.
Reinstalled Windows 10 and all drivers are verified as up to date, BIOS are also current
Removed PSU connector, swapped new power cable and changed it to another VGA power slot on modular PSU.
Changed GPU PCIe slot.
Tried another Video Card (Same Issue with different GPU).
Cleared CMOS.
Removed Motherboard Battery for 15 mins.

Removed Video Card and used only on-board video (this works 95% I think fixes issue for the most part).

If I do not use the GPU intensively it seems to boot fine.. (this is any GPU I have tried another.. not my just my specific GPU.. I have eliminated the GPU as the issue) The PC will boot correctly.. if i use the GPU in any manner that creates any heat at all. the PC DR DEBUG LCD gives me a code 00 and it does not recognize the CPU so I have Reseated the CPU no change.. When I do a Hard Reset on the PSU it works correctly again.

When there is no GPU in any PCIe slot and I am using my onboard cpu graphics the computer seems to work ok no issue shutting down or rebooting (mostly it happened 2 out of 20 reboots in beginning but after that it stopped, either way the issue is much much less.

Any thoughts or anything I missed lmk thanks!


My PC specs
Intel Core i7-6700K 4.0GHz Quad-Core Processor
CRYORIG H5 Ultimate 76.0 CFM CPU Cooler
ASRock Z170 Extreme6+ ATX LGA1151 Motherboard
G.Skill TridentZ Series 16GB (2 x 8GB) DDR4-3200 Memory
Samsung 850 EVO 250GB M.2-2280 Solid State Drive
Samsung 850 EVO-Series 1TB 2.5" Solid State Drive
Seagate Barracuda 3TB 3.5" 7200RPM Internal Hard Drive
Hitachi Deskstar NAS 4TB 3.5" 7200RPM Internal Hard Drive
Gigabyte GeForce GTX 970 4GB WINDFORCE Video Card
NZXT S340 (Black) ATX Mid Tower Case
EVGA 850W 80+ Gold Certified Fully-Modular ATX Power Supply
Microsoft Windows 10 Pro OEM (64-bit)




 

Robert_7

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Sep 8, 2015
28
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18,540
No unfortunately... I'm actually betting against the PSU being defective.. as long as I'm in windows the Voltage meter is flawless and the pc does not have any heat issues either.. the cpu never goes above 55c on extreme load and the GPU never exceeds 70c.. these asre all fine.
The +12v Volt line the GPU is connected too is a rock hard 12.288 and almost never moves.. the only issues with the pc are the cold boot. There are no random crashes or BSOD it works perfectly otherwise.

I'm thinking it a MB defect I just want to make sure its not a short on the MB and its something else because as said before my only issue us a boot one where the bios do not recognize the CPU when the GPU is in the PCIe slot.. w3ish I had another PSU to try though.