I have natty and have installed
kubuntu-desktop package. Before installing it, everything was fine but after that, this thing happens:
When I'm typing, after stroking a key, screen blacks out, fan speeds up, and I have to turn off machine by pressing power button.
It just happens in many different apps (chromium, hotot, kde proxy settings, ...) and in every environment: Unity, KDE, Gnome 2.
I don't know what details must provide with this question, and I don't like to remove my KDE desktop, or re-install Ubuntu.