screen blacks out after pressing a key on keyboard, specially enter key

Posted by ahmad598 on Ask Ubuntu See other posts from Ask Ubuntu or by ahmad598
Published on 2011-06-17T14:07:03Z Indexed on 2011/06/24 16:31 UTC
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black-screen

I have natty, and i 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 i must provide with this question, and i don't like to remove my kde desktop, or re-install my ubuntu. any ideas are appreciated ;-)

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