New system build is very unstable (randomly reboots all the time)

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m41miller

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Jun 8, 2015
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I just built a new PC a month or so ago, and I have been fighting with it ever since I got it setup. It reboots multiple times a day (just powers off instantly and then starts to reboot), and sometimes it gets stuck in a reboot loop and has to have the power pulled. I have ran every diagnostic that I know of, and I can't seem to narrow down what the issue is (although I DO believe it's hardware related). Here is a list of the components that I have installed and the steps that I have taken to test each one:

ASUS X99 Deluxe Motherboard
Updated to latest firmware (v.1702)
Reset CMOS
Pulled CMOS battery for 5 minutes
Installed all necessary drivers & double checked that there were no errors in Device Manager
Removed all USB devices (except mouse & keyboard)

Intel Core i7-5960X CPU
Ran Prime95 tests - passes Small FFTs & In-place large FFTs, but reboots pretty much right away when I try to run the Blend test
Core temps idle around 35C and stay under 55C when under load

NVIDIA Titan X 12GB GPU
Ran Furmark for 1/2 hour - no problems (GPU load was between 95-100% and temp around 75-80C)
Tried 3 different driver versions (currently using v.347.88 which is the earliest version available but seems to be the most stable with Premiere Pro and AE)

G.Skill Ripjaw 4 Series 32GB (4x8GB) DDR4 2400 Quad Channel RAM
Ran MemTest86+ through 12 full passes with no errors
Tried removing one of the pairs and then tried using different slots; didn't help at all

Other Compontents
EVGA SuperNova 850 G2 Modular PSU
Corsair H100i Liquid CPU Cooler
Fractal Design Arc Midi R2 Case
256GB Samsung 850 PRO SSD (Boot drive)
3 x 3 TB Seagate 7200 RPM drives in Striped RAID using onboard RAID controller
Sonnet Tempo Pro Plus SSD PCI card w/ 2 x 256GB Samsung 840 Pro SSDs
Syba 2-port 1394b + 1-port 1394a Firewire PCI card


I originally installed Windows 8.1, and then reinstalled it hoping the reboots were software related. I then went back to Windows 7 (which I am currently running) and still continue to have the issues. I am running Speedfan and MSI Afterburner to power Rainmeter in order to monitor temps. Also I use the computer mostly for video editing, so I regularly push the CPU and GPU pretty hard for rendering or previewing. Any ideas on how to troubleshoot my problem would be greatly appreciated.

 
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m41miller

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Jun 8, 2015
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Well on a whim a ran the Small FFTs test again and the computer rebooted right away. That was the first time I had seen that happen. I'll try running blend test tomorrow with each RAM stick individually and see if that reveals anything.
 
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m41miller

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Jun 8, 2015
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Ok so I tried each of the sticks in the first slot on my mobo. I ran two 5 minutes blend tests with Prime95 for each stick and here are the results as well as some notes for each stick:

Stick #1 - Booted up just fine
Test 1: PASS
Test 2: PASS

Stick #2 - Rebooted once right after power-on and then ran normally
Test 1: PASS
Test 2: PASS

Stick #3 - Continuous reboot loop. Pulled power a few times and never was able to get past reboot loop.
Test 1: N/A
Test 2: N/A

Stick #4 - No reboot, but the CPU clock all of the sudden got stuck at 1.14 GHz (usually runs at 2.93 GHz)
Test 1: PASS
Test 2: PASS

I figured while I was at it, I would take a known good stick of RAM (the first one) and try it in each of the 4 RAM slots that are recommended for quad-channel RAM. The 2nd & 3rd slots gave me reboot loops, while the 4th slot ran fine (still stuck at 1.14 GHz). I then took that same stick of RAM and put it back in slot one (which tested fine earlier), and it got stuck in a reboot loop again. I pulled power and it didn't help. I then moved it over to the 2nd slot and it booted up just fine.

This is what is so frustrating about this. The results don't seem to be consistent. Thoughts?
 
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m41miller

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Jun 8, 2015
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Ok thanks. I'll work on getting those replaced and check back when that is completed.
 
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m41miller

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Jun 8, 2015
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Quick update: I sent the mobo to Asus for repairs and just got it back/installed. Still having the same random rebooting issues. I called Intel to setup an RMA with them, and they told me it was most likely due to my RAM running at 2400MHz (apparently Haswell only supports 2133MHz officially?). I tried underclocking the RAM to 2133MHz and the problem still exists. However, I was able to keep my computer up long enough to run Intel's CPU stress test and it passed all the tests.

So are we still thinking CPU? Or maybe PSU? I watched inside the case on the last few reboots and the lights stay on on the motherboard even when the power drops out to everything else. So it seems like the power is at least staying on to the motherboard. I also double checked that my PSU has enough wattage and according to my calculations I should have at least 200 W of overhead.
 
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m41miller

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Jun 8, 2015
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Ok looks like I finally got it fixed. It was a bad mobo after all. Did an Advanced RMA with Asus and got a new motherboard, now everything runs great. Thanks for your help everyone!
 
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