Sudden failure AM5 system with 7800X3D

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1. Please tell us your current hardware:
(Please actually list here and do not refer to signature as this is not seen by some and hardware changes)

  • Processor (CPU): AMD Ryzen 7 7800X3D
  • Memory (RAM): Kingston FURY Beast DDR5 32GB (2x16GB) 6000MT/s DDR5 CL36 DIMM KF560C36BBEK2-32
  • Motherboard: ASUS ROG STRIX B650E-E GAMING WIFI
  • Power supply: BeQuiet Straight Power 12 Platinum 750W
  • Case: Fractal Design 7
  • Graphics card: Gigabyte 4070 EAGLE OC-12GD (1x 8Pin)
  • SSD: 2x m2 WD Black SN850X (2 and 4 TB)
  • Air cooling with Alpenföhn Brocken 4

2. Describe your problem. The more precisely and better you describe your problem, the better you can be helped (additional pictures could be helpful, for example):

I assembled the computer myself and have experience with it.
After assembly everything started as expected, I then installed Win11 pro and Suse Tumbleweed as a dual boot and started running the usual tests. All fans were running, responding to load and various fan curves.
Installed/updated all missing drivers under Win, updated BIOS.

Today I used it productively for the first time, image editing with Darktable under Linux. Everything is good, stable, fluid.
I didn’t shut down the computer for a longer break, but put it into standby (sleep to RAM). Worked, power LED flashed.

And then when I woke up…

  • PC reacts to being woken up by moving the mouse and starts up, the power LED lights up continuously
  • All fans are running, RGB lighting on the board is on

But:

  • No picture
  • POST code 00, after a long wait sometimes 46
  • Yellow diagnostic LED (RAM) lights up, after a long wait the red one (CPU) also lights up

3. What steps have you already taken/tried to solve the problem and what did it achieve?

  • Hard shutdown
  • Power supply off, power cable removed
  • CMOS reset via button
  • Buffer battery out/in
  • Ram replaced and bolts inserted individually
  • Cooler removed, CPU removed, visual inspection of CPU and socket ok, reinstalled

Nothing.

I’m assuming there’s a defect in the CPU, RAM or mainboard (in my opinion, the probability is decreasing in that order). Unfortunately, I can’t counter-test it, it’s my first and only AM5 system.

What I find striking is the fact that the whole thing occurred immediately after a standby to RAM.

Do you have any other thoughts on this?

Thank you and nightly greetings,
Mr. Carson

PS: Also note the various pinned topics and the forum search. You may already find the solution to your problem there.

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