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Well, what do you know? I can add to the list of KAMRUI Mini PC Model: AM07 owners who have what appears to be a d.e.a.d Kston SSD (K765-512GB). At least, that's what I'm assuming is the issue. The unit only boots into the BIOS. No sign of the drive in there either.

Bought July 1st, 2023 from Amazon.

By seeing all these reports of the same issue, at least I can feel confident it's more an issue with the cheap and nasty Kston and hopefully not the motherboard.

Update: I bought a replacement nvme SSD as well as a dual-bay external enclosure. This helped me confirm the Kston SSD is dead.

However, when powering on the AM07 (rather than rebooting), it boots to BIOS settings. I have to make a BIOS setting change + Save & Exit in order for it to boot into the OS from there.

So I suspect my next task is to isolate and replace the BIOS/CMOS battery, assuming that the settings aren't retained when "cold".

In troubleshooting, I inadvertently bought an m.2 SATA SSD and learned the AM07 accepts both m.2 nvme and SATA SSD types! I wish I'd figured that out before buying another m.2 SSD, this time an nvme, and realizing the OS install showed the SSD (where the BIOS doesn't!).

RedLimey, good job on troubleshooting. It's frustrating when a drive dies; and they all will, eventually.

I've found that if an m.2 slot can handle NVMe, it can also handle a SATA drive. However, NVMe are generally faster, and often less expensive, so it's usually better to go with that type of drive if you can.