Au faite, en rajoutant vga au bout de la ligne du fichier de configuration, maintenant, à chaque démarrage il me demande de choisir qu'elle définition... :S
Contenu du fichier /boot/grub/grub.conf :
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd0,0)
# kernel /vmlinuz-version ro root=/dev/mapper/VolGroup-lv_root
# initrd /initrd-[generic-]version.img
#boot=/dev/sda
default=0
timeout=0
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Fedora (2.6.31.6-166.fc12.x86_64)
root (hd0,0)
kernel /vmlinuz-2.6.31.6-166.fc12.x86_64 ro root=/dev/mapper/VolGroup-lv_root LANG=fr_FR.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=fr-latin9 rhgb quiet vga=794
initrd /initramfs-2.6.31.6-166.fc12.x86_64.img
title Fedora (2.6.31.6-162.fc12.x86_64)
root (hd0,0)
kernel /vmlinuz-2.6.31.6-162.fc12.x86_64 ro root=/dev/mapper/VolGroup-lv_root LANG=fr_FR.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=fr-latin9 rhgb quiet vga=794
initrd /initramfs-2.6.31.6-162.fc12.x86_64.img
title Fedora (2.6.31.6-145.fc12.x86_64)
root (hd0,0)
kernel /vmlinuz-2.6.31.6-145.fc12.x86_64 ro root=/dev/mapper/VolGroup-lv_root LANG=fr_FR.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=fr-latin9 rhgb quiet
initrd /initramfs-2.6.31.6-145.fc12.x86_64.img
