Grub boot menu is invisible

[Bart Heideck]

Hello everyone,


Recently I upgraded my quite old system to a more modern version(Intel Comet 
Lake processor). Only the hard disk remained. Due to theage the HDD still has a 
msdos partition table with grub-pc 2.04installed.

Afterswitching the BIOS to CSM mode (legacy BIOS) and turning off secureboot, 
the system was booting up again. However, after POST, when thegrub menu should 
appear, the screen turns black. A few seconds later(as set in the config files) 
the default kernel boots up, showing itsboot logo.

I triedtweaking the config files by setting GRUB_TERMINAL=console 
andGRUB_GFXMODE=text, but without any success.

Inanother experiment I used a live disk on USB stick, with grub 2.06.If I boot 
from USB using UEFI, grub works as expected. If I boot fromUSB legacy same 
thing happens as above: The grub menu remainsinvisible, after the timeout the 
default boot option starts up.

To meit looks like using grub in legacy mode is to blame for thebehaviour, 
however I’m at loss on how to proceed here. So I hopesomeone here on this list 
has an idea how to fix this issue. Ialready searched the web and grub bug 
tracker, but couldn’t findany solution.

Pleaselet me know if you need more information on the system or the configfiles.

Thankyou in advance for your support.
Bart