New board will be UEFI, but have CSM.
CSM is now being obsoleted, starting this year. Some vendors already announced no more CSM/BIOS mode.
https://support.lenovo.com/us/en/sol...-2020-products
Do you not have backup?
That is one thing we always are suggesting.
If new motherboard in UEFI mode, you have to add a new entry into motherboard's UEFI to have it know where to boot.
You can use efibootmgr, but most just reinstall grub in UEFI mode from live installer or use Boot-Repair.
If nVidia, you may need nomodeset.
I would suggest also converting to gpt, it can be done without data loss, but backup still required just in case.
And using gparted to make a drive gpt erases it, you have to use gdisk to convert it.
Bit surprised you are doing new motherboard & video card, but not new drives. Adding an SSD in 2011 was one of the best things I did. It was very small as then expensive, so just a 60GB for booting.
I typically do new drive with every new build and often replace main working drive inbetween new builds.
Just do not trust drives as they have failed. And I have multiple back ups. Old drives become backup drives, so used less, but many still functional (for now).
Another user who started upgrade and now needed backup.
https://ubuntuforums.org/showthread....3#post14019693
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