Post error - but only after 3+ days of uptime

Tea-Sir · June 23, 2024

Hi all

Got a strange one here.

I always put my PC to sleep, and only restart when Windows does updates (And no I can not be bothered to wait 2-3 minutes for my PC boot ). Lately my PC has started during the restart to fail during POST. Windows shuts down fine, but during the boot, my motherboard lights up the DRAM diagnostic light, and after a short time, the PC just shuts off. It quickly powers itself back on, and then it is 50/50, if it lights up the DRAM og GPU light.

If I restart the PC (Shut off the PSU, wait 10 seconds and the power on the PSU and press the power button), it will open BIOS, with the message that it was booted in SAFE mode.

If I do nothing and just save and exit, Windows will spit out an error about needing to be reparied, I can either enter UEFI or Repair Windows, either will trigger a restart, and either my DRAM or GPU diagnostic light will stay on.

I can revive my PC by shutting of the PSU, waiting and then turning it all on again. But then Windows error. Restart, and I there is the loop.

This will continue either until I clear CMOS, or as I have figured out, disable DOCP and run my RAM at base speeds. Enter the BIOS at first reboot, and re-enable DOCP, and let the PC restart.

Then my PC works just fine, until it has had 3+ days of uptime (3 days is so far the shortest time, where I have been able to re-create the issue)

I can stress my PC as much as I want for as long as I want, nothing will fail. I can sleep it for 30 days (Using it every day), no problem.

Memtest gives no errors.

What the heck is broken here?

I have already swapped the CPU (Went from 7700X to 7800X3D), that didn't change anything. (I thought maybe the memory controller was defective)

I am currently on a loaned set of RAM, to see if I have bad sticks.

I am leaning towards the RAM being broken somehow, I have just never seen RAM fail this way before. And I don't like that the GPU light comes on. (Diagnostic light)

I am hoping the GPU light is just red herring.

I had my GPU on a riser at first, but that is know out. The GPU is directly in the PCI-Express x16 socket.

My specs are as follows:

Motherboard: ASUS ROG STRIX B650E-F Gaming WiFi (1 year, 6 months old)

CPU: AMD Ryzen 7800X3D (3 days old) - OLD CPU: AMD Ryzen 7700X (1 year, 6 months old)

RAM: - My own: Corsair Domminator Platinum 2x16GB at 6000MHz CL36-36-36-76 (1 year, 6 months old)

RAM: - On loan: Corsiar Domminator Platinum 2x32GB at 6000MHz CL40-40-40-77 (Maybe 1 year, never used)

GPU: - Gigabyte nVidia GeForce RTX 4080 Super Gaming OC (2 months old)

PSU: - Seasonic Focus GX 750 ATX 3.0 (2 months old)

SSD: - Kingston KC3000 2TB (6 months old)

Windows was re-installed 2 months ago (Windows 11)

Any help, advise or insight is very appreciated. Thanks in advance