Nvidia Digits build won't POST. Very desperate for help!

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jamiis

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Jun 7, 2016
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I am building a machine learning workstation based on the NVIDIA DIGITS Devbox. Here is my parts list:

CPU: Intel Core i7-5930K 3.5GHz 6-Core Processor
CPU Cooler: Corsair H60 54.0 CFM Liquid CPU Cooler
Motherboard: Gigabyte GA-X99P-SLI ATX LGA2011-3 Motherboard
Memory: Crucial 64GB (4 x 16GB) DDR4-2133 Memory
Storage: Sandisk X400 1TB M.2-2280 Solid State Drive
Video Card: Asus GeForce GTX Titan X 12GB Video Card (2-Way SLI)
Video Card: Asus GeForce GTX Titan X 12GB Video Card (2-Way SLI)
Case: Corsair Air 540 ATX Mid Tower Case
Power Supply: EVGA SuperNOVA G2 1600W 80+ Gold Certified Fully-Modular ATX Power Supply
Monitor: Asus PB287Q 28.0" 60Hz Monitor
Mouse: Mionix NAOS 7000 Wired Optical Mouse

It is not POSTing at all (no beeping indicating successful or unsuccessful BIOS load). Initially, there was a continual reboot sequence happening but then I adjusted the RAM and made sure it was pushed all the way down and now I get constant power (the strip-light on the motherboard is lit up and the fans all spin) but still no POST. I finally assumed the motherboard was simply faulty and bought a completely new motherboard but that left me with the same result.

I desperately need help! I feel like I've tried so many things.

The case doesn't come with standoff screws for the mobo they're just on there so I don't believe it's shorting out. I'm 99% sure the CPU is perfectly placed. Maybe the RAM is incompatible or something? I've removed the GPUs entirely and RAM except 1 stick. I've reset CMOS once by popping the watch battery out and then putting it back in. Right now I have CPU power, mobo power, and the F_PANEL power led, reset, etc. connected, as well as 3 SYS_FAN, 1 CPU_FAN, and the CPU_OPT connected to liquid cooling. I'm going out to a monitor through the USB-C port -- not that it should matter since it's not even posting yet. I "tested" the power supply as directed in the manual by plugging it in and ensuring the fan turned on.

Any help is appreciated!!!
 
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T

Themastererr

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May 22, 2016
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Gigabyte motherboard use a dual BIOS. You can't just pop the battery in and out quickly to fully reset the CMOS. It sounds like you have a defective CPU but try this procedure first just to be sure. Follow every step please.

>Take out all RAM sticks leaving only one closest to CPU in
>Unplug power cable, LAN cable, Monitor cable - P.C is now separate from ground
>Flick power supply switch > Press power button to discharge capacitors
>Remove CMOS battery
>Locate CMOS jumper pins. These are located bottom right corner above your I/O connections. Look for two pins protruding vertically from motherboard (you will CMOS_RES in white letter beside it)

>Touch pins with metal screwdriver for 5 seconds to short the connection.
>Place battery back, plug cables back in, turn on P.C

If you have a successful boot. Go into BIOS, load optimized defaults. Turn off computer, put other RAM sticks back in and continue use.

If BOOT fails, take out all components and test on a wooden or glass table, if computer boots, you have case shorting issue.

Also, make sure you do not tighten down liquid cooler too much, you will fracture key logic points or cause motherboard to short and not boot.
 
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J

jamiis

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Jun 7, 2016
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My motherboard manual says to put RAM in slot 3 if you only have 1 stick.
layout: [1] [2] [3] [4] [CPU] [5] [6] [7] [8]
When I put RAM into the "closest" slot -- either slot 4 or slot 5 -- the computer constantly reboots every ~5 seconds. When I put it into slot 3 it has constant power, albeit still no boot. I've heard "closest" to the CPU before.

Going to remove from case and test now
 
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Themastererr

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May 22, 2016
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Yes, put it where the manual states too. Did you try a proper CMOS reset yet?

Good luck.

 
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jamiis

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Jun 7, 2016
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I did the proper CMOS reset. I can try again. I just finished attempting to boot with the mobo outside of the box and nothing changed: still constant power with no boot.
 
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J

jamiis

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Jun 7, 2016
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Although the manual says it comes with 1 standoff screw, the existing standoffs inside the case separate the mobo and the case and there is a central nub that fits perfectly into the mobo and the IO ports in back perfectly align with the IO shield. I am quite sure it did not come with any standoff screws and I'm pretty sure they're just part of the case ... is this too odd to be correct? It fits perfectly.
 
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Themastererr

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May 22, 2016
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Corsair usually comes with pre-set standoffs. You should be ok in that regard.

Also, you had at least 1 GPU connected when you tested out of case boot right?


 
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jamiis

Commendable
Jun 7, 2016
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I did not. I figured the motherboard had a builtin, weak graphics card, right? when I did have the GPU(s) connected they successfully powered on but still no boot.

also, do all motherboards have speakers? as in, might might it be correctly booting but not beeping and not sending video properly over usb-c which is connected to a dongle that connects a 4k monitor via displayport?
 
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Themastererr

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May 22, 2016
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You have to have a GPU for boot. That CPU has no onboard graphics. No, motherboard speakers are optional in 2016 and you will have to buy one separate to hear error codes.

Try one GPU out of case and make sure PCI power connectors are in place and firm.
 
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J

jamiis

Commendable
Jun 7, 2016
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Oh my god you are the best. Thank you!!! Just to note: I did not have the GPU plugged in and was attempting video out from the motherboards usb-c. That was noob. I am not sure at what point I read or assumed that the USB-C was used for video out.

Here's another question I have if you don't mind me asking. There is a DisplayPort *In* on the motherboard. And the Gigabyte website talks about plugging in your GPU into the DisplayPort In. I also have SLI across the 2 GPUs. So should I connect the two GPUs by SLI and then plugin one of the GPUs into the motherboard via DisplayPort and then do video out through usb-c? I think I got the idea of video out through usb-c from the Gigabyte website so although what I just asked sounds overly complicated I swear they're doing something like that haha.

THANK YOU AGAIN! Totally ignorant to the fact that speakers are optional and I was focusing on the wrong problem! Realizing that and then plugging into the GPU worked.
 
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Themastererr

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May 22, 2016
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Noway! Awesome man. See that is why you always do the process of elimination even including the simple things.

If you want my honest opinion, I am not familiar with the newest display port technology. I'm fairly confident SLI will just use the one display connection on the main GPU, I would plug into that one.

Congrats on getting your new system going.
 
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