Compaq Server Won't Install - System Formatted At Every Start Up

I have a Compaq Proliant 8000 here that had Red Hat Linux pre-installed and in working order. My company then decided that it wanted Small Business Server 2003 installing, so after using Compaq Smartstart to format and re arrange the disk arrays, which is no problem at all system formatted then a raid 5 disk array set-up which smart start detects and reads correctly However, now that is done the system will NOT install SBS 2003 or any other operating system at all, at the point of the install where the disk reads "Windows Set-up" the system just stops and freezes, this happens with other disks and different O/S discs.