Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

В процесе загрузки выдает сообщение

VFS: Cannot open root device "sda3" or unkown-block(0,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

sda1 /boot
sda2 swap
sda3 /

fstab

/dev/sda1 /boot ext2 defaults 1 2
/dev/sda3 / ext3 noatime 0 1
/dev/sda2 none swap sw 0 0
/dev/cdrom/cdrom0 /mnt/cdrom iso9660 noauto,ro 0 0
none /proc proc defaults 0 0
none /dev/shm tmpfs nodev,nosuid,noexec 0 0

grub.conf

default 0
timeout 30

splashimage=(hd0,0)/boot/grub/splash.xpm.gz

title=Gentoo Linux

root (hd0,0)
kernel /boot/2.6.12-gentoo-r9 root=/dev/sda3

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