No way to boot on 2.6.23.12-52.fc7

[pd520 at york.ac.uk]

Hello,

I do not understand, I still cannot boot on the new kernel: 
2.6.23.12-52.fc7

This is my grub.conf:
boot=/dev/sda
default=0
timeout=10
splashimage=(hd0,7)/boot/grub/splash.xpm.gz
hiddenmenu
password --md5 $1$Ey8yydw2$Ia5NHuLvdjduWOKIJM57u0
title Fedora (2.6.23.12-52.fc7)
         root (hd0,7)
#        kernel /boot/vmlinuz-2.6.23.12-52.fc7 ro root=LABEL=/ rhgb quiet 
selinux=0
         kernel /boot/vmlinuz-2.6.23.12-52.fc7 ro root=/dev/sda8 rhgb quiet 
selinux=0
         initrd /boot/initrd-2.6.23.12-52.fc7.img


title Fedora (2.6.21-1.3194.fc7)
         root (hd0,7)
         kernel /boot/vmlinuz-2.6.21-1.3194.fc7 ro root=/dev/sda8 rhgb 
quiet selinux=0
         initrd /boot/initrd-2.6.21-1.3194.fc7.img


I have not problem to boot on: 2.6.21-1.3194.fc7
With the new kernel, if I put:
kernel /boot/vmlinuz-2.6.23.12-52.fc7 ro root=LABEL=/ rhgb quiet
selinux=0

if fails because it try to boot on a /dev/sdb, so I force it to boot on
/dev/sda8, but I get:
setuproot: moving /dev failed No such file or directory
setuproot: error mounting /proc
setuproot: error mounting /sys

In what these 2 kernels are so different ?

Regards

---
==========================================================================
  Patrick DUPRE                      |   |
  Department of Chemistry            |   |    Phone: (44)-(0)-1904-434384
  The University of York             |   |    Fax:   (44)-(0)-1904-432516
  Heslington                         |   |
  York YO10 5DD  United Kingdom      |   |    email: pd520 at york.ac.uk
==========================================================================