Hi, I just changed the motherboard of a centos 4.4 installation for a new one. this new one has a SIS chipset. Now when i boot from the hard disk i get a kernel panic (unable to find root, no hdd found , etc)
To me it sounds like your kernels initrd is likely configured for lvm. You might want to try taking the initrd from the centos cd/dvd and using that instead, or try booting the kernel without the initrd parameter and hope it works :)
Or go into the initrd and edit it by hand. it's either a gzipped cpio archive, or a gzipped ext2/3 filesystem.
You may also get away with simply changing the boot device listed on the kernels command line. You did edit /etc/grub/menu.lst right?
-Maciej