boot problem

[Ralf Mardorf]

On Wed, 11 Aug 2021 19:58:56 -0700, Bob wrote:
>I have replaced an old computer (BIOS not UEFI) with a new one, Lenovo
>5 Desktop 90NA001DUS.  Moved the hard disk from the old computer to
>the new computer.  Booting a USB live CD it shows the disk drive is
>SDA which it was in the old computer.  I moved the disk drive to boot
>before the SSD which contains win10.  I have disabled security boot in
>the new computer.  The system still boots win10.
>
>Any ideas on how to get this disk drive to boot?

Hi,

sda is a kernel name descriptor for a block device. Those can change
with each boot. It's better to use persistent naming, such as by-label.
While in my experiences even sda, sdb etc. are persistent, you can not
use an USB stick with a live ISO to check, if the drive is or isn't
sda.

However, you might need to reinstall the bootloader and/or edit BIOS
settings.

You mention "security boot", does this mean there's an option named
"security boot" or "secure boot" that can be enabled or disabled, or
are there several options such as "CSM support", "Boot mode selection"
and "Storage Boot Option Control"? My mobo has got no "secure boot"
option, but a "CSM support" option and those other mentioned options to
select between different "UEFI" and "Legacy" settings/combinations.

Just in case, after changing the boot order you did not forget to save
the settings?

Regards,
Ralf