Get hold of an Ubuntu/Kubuntu LiveCD, and boot from it. If everything works, your hardware is fine! In any case, in Ubuntu you can use System>Administration> Hardware Drivers/ Hardware Testing .
GNOME device manager
This is a GNOME program to manage devices and device drivers. It's inspired by hal-device-manager, from the HAL project, but rewritten in C for efficiency and an outlook to actually make it manage devices rather than just show information.
For hardware help in Ubuntu, see: