Lenovo won't boot with 22.1 on internal ssd (no OS found)

[GiantJack]

Hi!

I'm struggling with my lenovo m720q to boot on internal SSD (PCI NVME) with 22.1.
it was working fine for months before with older version.

Install works fine but I tried several bios & install settings without success: when reboot, it says error 1962, no operating system found (boot loop).
I though ssd was dead so I tries a new one: same issue.

As a temporary work around it does boot and reboot fine with installation on external USB HDD (an old 80GB I had in my drawer)


ideas welcome...