ok, try this. if you have a copy of 9 on some other program disk- like a disk repair app., drag and drop the system folder to your hd. you might even be able to locate the system folder on your install disk and do this. now try rebooting from 9 cd. if that doesn't work try booting from the copied disk version and then running your install disk from there. do a clean install. I had to do this once when part of my installed system 9 went corrupt and i could only load osx.
one other option that just occurred to me after rereading everthing is inserting your disk while in x, go to startup disk in system preferences and choose the disk as startup. if by chance you get stuck with disk as startup after the install, you might need to manually eject disk during restart before it starts accessing it.all should go back to normal and you can move back and forth between them thru startup disk.
i guess part of the question here that people seem to be assuming, including me, is that you have the original system disks. what disks did you actually get from your employer and if they're not the originals, any chance you could hunt them down and at least borrow them and make copies.?
if you are trying to use a 9.2.1 update disk, they are notorious for not launching by holding down c..