There is a problem with that filesystem on which you think you have installed the system. After that it fails to get an initrd file, which is probably vital to successful running (may set up some drivers for some of your hardware).
You mention a 'caddy' - is the drive for linux ide connected?
I think I would go back to the installation DVD, and read the Readme and any notes files. They may tell you that, when booting from it there is an option for rescue - the one you could try next. I can't say what it is, as I haven't tried this particular DVD installation (sometimes you do 'linux rescue', sometimes there is a function key to press ...)
If you can get into the rescue mode, you could try to see if it recognises the filesystem ...