Threadripper system won't POST after crash

[ToothOgre]

Hello all,

I have a 3 year old system running a Threadripper 3960x on a Gigabyte Aorus Master TRX40 motherboard (detailed specs below). It's been running great for me up until last week where I had left it idle sitting on the windows desktop and came back a couple hours later to it having shutdown. When I tried booting it back up it would power on but get stuck on the POST error code 9C (I have debug leds on the motherboard).

 

The display does light up but is stuck on the motherboard splash screen and even though it shows the "press del to enter bios" etc messages my keyboard input does nothing no matter how angrily I mash the keys. I looked up the error code in the manual and it says that this is a "Detect and install all currently connected USB devices" code. 

 

What I have tried so far:

• Removed all non-essential items from the motherboard, disconnected all external peripherals, onboard headers, nvme and ssd.
• Single stick of RAM 
• Different lower clocked single stick of RAM
• Swapped GPUs
• Different power supply 

But still no luck, any help of advise is appreciated, this is an expensive system that I use for a work and would rather not have to replace it. 

 

Full system specs:

• CPU: AMD Threadripper 3960x 
• Motherboard: Gigabyte TRX40 Aorus Master (rev 1.0) 
• RAM: G-Skill F4-3600C16Q-64GTRSC (4 x 16 GB kit)
• GPU: Nvidia FE 2080 super 
• NVME: WD Black SN850x 2TB M.2 nvme
• PSU: Corsair RM1000

 

Thanks!

[Whatisthis]

Try a bios reset first.

 

If the board is throwing an error on the usb without anything plugged in it could be a faulty controller on the board. Components sometimes die for no apparent reason. 
 

The cpu gpu and ram all passed post so they shouldn’t be the issue.

 

You may need a new motherboard.

[ToothOgre]

I wrote up the post in my notepad and pasted it in here, looks like I accidentally left out the paragraph where I mentioned some more things I had tried. I'll mention them below:

• Already tried a BIOS flashback with the latest BIOS
• Sent the Motherboard for (out of warranty) repair to Gigabyte and just got it back today, they're claiming that
  • They "fixed" it by resetting and flashing the BIOS (something I had already tried) 
  • And that they were able to boot into windows using their own CPU, RAM and SSD. I would be more skeptical of their claims but my motherboard is now missing it's nvme screw so clearly they at least installed something in there to test
  • When I try it with my CPU and RAM I still get the 9C  BIOS error code, same as before

Is there a possibility it's not my motherboard and my Threadripper CPU just spontaneously died while running ?