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Try booting with the parameter vga=normal or vga=791, and see if it solves your problem. If it does, add it to your /etc/lilo.conf (or what boot loader you are using), and run /sbin/lilo.
even thought that solved the problem, i seem to get the same problem again now... i have been installing new versions of kde but thats it. i tried changing to vga=normal any suggestions?