My guess is that DSL doesnt have some of the drivers necessary to boot on this machine.
Remember that DSL is command prompt only, and doesnt have some of the nice tools Kubuntu has (No Apt-Get, or any package manager for that matter).
If you havent used anything but Kubuntu before, you're making quite a big jump.
You might want to try slackware as a middle step. Getting DSL to work perfectly can require knowledge of the linux module system, which is something I dont have, and therefore cannot help you.
Heres a link for slackware: http://www.slackware.com/
- My statements do not establish the official position of Microsoft Corporation, and are my own personal opinion. (But you already knew that, right?)