En FC5, l'option noselinux ne me semble pas exister. je me référe à la documentation SELinux:
http://fedora.redhat.com/docs/selinux-faq-fc5/#id2962490
Je cite:
Q: How do I turn SELinux off at boot?
A: Set SELINUX=disabled in /etc/selinux/config.
Alternatively, you can add selinux=0 to your kernel boot parameters. However, this option is not recommended.
[Caution] Be careful when disabling SELinux
If you boot with selinux=0, any files you create while SELinux is disabled do not have SELinux context information. The file system is marked for relabeling at the next boot. If an unforeseen problem prevents you from rebooting normally, you may need to boot in single-user mode for recovery. Add the option emergency to your kernel boot parameters.