You might need to specify kernel boot time options in grub.conf, although if memory serves me correctly you would have needed to have specified the options at the boot: prompt when running the install... I am thinking maybe lba=32, linear or load module options perhaps ? Probably barking up the wrong tree but, you never know!! Might be worth checking it out on a google search (look at your hardware config, scsi, usb, drives etc. first and then see if you can find anything via google search)