Steam Machine (2nd Generation): No NVMe Detected After RAM/SSD Upgrade on 2026 Steam Machine - lspci C

Thu, 16 Jul 2026 12:39:01 -0700

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?

⟐ Answer edited Temmuz 16, 2026 at 12:39 GMT-7

Steam Machine (2nd Generation): How can the internal storage be upgraded?

Tue, 14 Jul 2026 17:53:54 -0700

I have finally gotten my Steam Machine and now I want to upgrade the internal storage like I planned to. The challenge is that it isn't as simple as taking out the 512 GB SSD and installing the larger SSD, since the SSD the SM came with has the OS and all data on it. I am not very tech savvy and have tried to connect other external drives to the SM to try and transfer ALL of the data off of the SD, but that doesn't work. Is there any way to transfer the OS between SSDs without having to obtain any other devices?

⟐ Answered Temmuz 14, 2026 at 17:53 GMT-7

iFixit - Answers With Device "Steam Machine (2nd Generation)"

Steam Machine (2nd Generation): No NVMe Detected After RAM/SSD Upgrade on 2026 Steam Machine - lspci C

Steam Machine (2nd Generation): How can the internal storage be upgraded?