I have an old pentium box that's a candidate for a sarge install. It has a hdd and a cd. The bios does not detect the cd, and the boot order can only be set to A:/C: or C:/A:. Hence, it cannot be set to boot from the Sarge CD.
Smart Boot Manager "might" be a solution. Also called sbm. Google for either of these terms and Linux or Debian to learn more.