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Thanks for the help. I've added more info...
It's impossible to accurately answer all your questions without knowing
your gfxchip (lspci) or display model (hwinfo)...
Grub doesn't recognize any of those commands, but from hard copy:
Display adapter: NVIDIAGeForce4 8X AGP ; Display: LG W1953TV ; Pentium 4 3.0
1-Check if Plymouth is installed. If yes, purge it.
Did not find it.
2-If Plymouth is not relevant, try testing changes to Grub's boot time
parameters by hitting the "e" key as soon as the Grub menu appears, and
remove quiet and splash from it. If it works, change /etc/default/grub
to match and run grub-mkconfig.
No quiet or splash in /boot/grub/grub.cfg but you give me an idea: is
there a way to copy /etc/default/grub to a memory stick, edit it on
another machine, then write it back? There is no mount command in the
grub set.