Boot fails after installation

[pit_haris]

Hello everyone.

I just install the new Sabayon 7 amdx64 Gnome on an external hdd conected via usb on a vaio vgn sz 650 n. The installation progress completed without any errors. Anaconda ask for reboot and i press the button.
On booting procedure i had the following error:

"Block device /dev/mapper/vg_sabayon-lv_root is not a valid root device.
Could not find the root block device in.
Please specify another value or press: Enter for the same, type "shell" for a shell, or "q" to skip root block device."

I follow all three steps (press ENTER, press Q, type shell. I think the solution is inside shell but i don't now how to fix the problem.
Please help.....

GRUB configuration is:
setparams 'Sabayon GNU?LINUX, with Linux x86_64-3.0.0-Sabayon'

load_video
insmod=part_msdos
insmod=ext2
set_root='(hdd1,msdos1)'
search --no-flopy --fs-uuid --set=root 650260e4-2b3f-4ed4-be93-637579b91ede
echo 'Loading Linux x86_64-3.0.0-sabayon...'
linux /kernel-genkernel-x86_64-3.0.0-sabayon ro init=/Linux rc splash=silent,theme:sabayon vga=791 console=tty1 quiet dokeymap keymap=us domdadm resume=swap:/dev/mapper/vg_sabayon-lv_swap real_resume=/dev/mapper/vg_sabayon-lv_swap dolvm root=/dev/mapper/vg_sabayon-lv_root docrypt
echo 'Loading initial ramdisk...'
initrd/initramfs-genkernel-x86_64-3.0.0-sabayon

[rbwj1]

Did you ever get this resolved? I just installed Sabayon 8 to to /dev/sdb2 on my system and had the identical problem. Seems like there is something wrong with the grub menu entry. I'm not sure--I'm pretty green with linux! This is 2nd distro on my machine. Linux Mint is on /dev/sdb1. Windows 7 is on /dev/sda1&2. Both of the others work & boot correctly.

[ExpatPaul]

I have just had exactly the same problem. I fixed it by re-installing the bootloader from the installer.