1 No NVMe Detected After RAM/SSD Upgrade on 2026 Steam Machine - lspci C
Hey everyone,
I’m running into a brick wall after trying to upgrade my 2026 Steam Machine and could really use some hardware-level insight.
What I did:
I opened up the system to add a second 16GB stick of RAM and upgrade the internal NVMe SSD. I was incredibly careful, used a plastic spudger to disconnect internal components, and ensured wall power was pulled well before touching anything.
The Problem:
When booting into the SteamOS recovery USB to install the OS on the new SSD, it fails to detect the drive entirely, giving the error: !! /dev/nvme0n1 does not exist -- no nvme drive detected?.
Even worse, when I swap the original, known-working NVMe SSD back in, the BIOS still reads the storage slot as completely empty.
Troubleshooting I've already done:
Isolated the RAM: Completely removed the new 16GB stick to rule out dual-channel memory training issues or PCIe lane interference. Running just the original factory RAM right now.
Physical Seating: The SSD is fully inserted (heard the click), laid completely flat, and properly screwed down.
Ribbon Cables: Since the SSD slot sits on a daughterboard, I inspected and re-seated the bridging ribbon cables. They latch smoothly, sit perfectly square, and there are no visually bent copper contacts.
Boot Logs: The system passes POST perfectly fine with all green [ OK ] flags, but black-screens right after initializing the graphical interface because the installer script can't find a target drive.
Terminal Diagnostics: Popped open Konsole in the live environment and ran lspci. The system successfully lists the Radeon graphics, Qualcomm Wi-Fi, and USB controllers, but the Non-Volatile memory controller (NVMe) is completely missing from the list.
It seems like the CPU is entirely blind to the storage PCIe lanes or the M.2 slot isn't getting power.
Before I officially write this off as a blown motherboard power rail/micro-fuse or an invisible hairline fracture in the ribbon cable, has anyone else encountered this absolute storage blackout after a dual RAM/SSD upgrade? Are there any specific daughterboard quirks or hardware resets I'm missing?
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2 opmerkingen
Hi @dillpixel7767
Don't know but if possible you may be able to check if power is getting to the slot.
At least this will narrow down the problem to either a power supply problem or something else.
Here's a link that shows the pinout for an M.2 connector Scroll down to the key M table (Usually an NVME SSD is an M key type)
door jayeff
Same issue here. Took it completely apart and the issue persisted. Was able to get it to work after a few more tries but the cable seems to be finicky or possibly have a bad connector. Had to put in a support request because I don't trust that it won't stop working.
door Rew