> centos-3.3-initrd centos-3.3-kernel > centos-3.4-initrd centos-3.4-kernel > centos-4rc1-initrd centos-4rc1-kernel > centos-4.0-initrd centos-4.0-kernel these will work fine. the problem is with names like linux-kernel-2.6.0 kernel-centos-4.0 where the .0 is take to be a file extension meaning a special type of file... and the problem is only with the kernel image (which is booted by pxe) not with the initrd (which although booted by pxe doesn't require extensions to determine it's an initrd since it's specified as such in the configuration file). Cheers, MaZe.