Hey everyone, I'm encountering a frustrating issue with my RTX 5090 after running it for about 48 hours in a custom cooling loop. Initially, everything was working perfectly, but now, after a standard system restart, I'm getting no display output.
Here's the current situation:
- The motherboard's VGA Debug LED is on.
- The card is drawing approximately 21.8W to 22.1W, as confirmed with my Thermal Grizzly WireView.
- It doesn't appear in Windows when using the integrated GPU, and when I run nvflash.exe --list, it says "No adapters found."
Interestingly, this card worked flawlessly for two days even under heavy load. While looking through the BIOS settings (ASUS ROG/AM5), I noticed that the "NVIDIA dGPU Power Enable" option had been set to Disabled, so I changed it back to Enabled and forced a Gen 4 Link Speed using a Gen 4 riser. Unfortunately, even after saving those changes, the card still only draws 22W and won't initialize.
Here's my system setup:
- CPU: Ryzen 9 9950X3D (Delidded)
- GPU: RTX 5090 (with EK-Quantum Block)
- OS: Dual Boot with CachyOS and Windows 11
- Riser: Gen 4 Premium Riser
Things I've tried so far include:
1. Swapping the WireView for a direct 12VHPWR cable from the PSU. No change.
2. Reseating the card, testing it directly in the PCIe slot, but I'm still seeing the VGA light.
3. Adjusting various BIOS settings including forcing PCIe to Gen 4 and ensuring "NVIDIA dGPU Power Enable" is enabled.
4. Performing a full CMOS clear and even a power drain.
5. Switching the physical VBIOS on the card to the secondary BIOS.
Is drawing 22W an indication of an "Internal Power Failure" for the 5090? I'm starting to think it might be a motherboard safety feature kicking in, but I'd love to get some insights before I dive into an RMA.
2 Answers
Wow, you've tried a lot already! It sounds like it might be time for a more drastic approach. Have you thought about rebuilding your loop? Sometimes just resetting everything can clear weird issues. Good luck!
Have you plugged your monitor directly into the motherboard to check for any POST signals? This way, you can see if it's a GPU issue or if the whole system isn't posting. Also, did you verify that the riser cable isn’t causing any problems? What PSU are you using?
Yeah, I did check with my RX 6600 and the integrated GPU. They both showed POST, but the RTX 5090 isn’t listed in any software like GPU-Z or Task Manager. I’ve also tried both the squid adapter that came with the card and my PSU cable (1200W PSU) to rule out power issues.