I'm trying to install server 2003 onto a server that previously had 2008 on it. When I boot from CD and it goes through the motions it comes up saying hard disk not found. This I put down to ahci mode being enabled so I went to remove it, but it was already disabled. The disk shows up in BIOS and if I want to boot from it, I can.
This is an old RM CC3 server so it did have 2003 installed a few years back if that helps at all.