when I boot with the BT4 DVD everything is OK until i start booting into KDE. When type "startx" system starts loading but right after that i get a white screen. I can hear the DVD-ROM reading from the disc and also the sound "Finish Him" but at this moment all i get is a white screen.

I have also tried "bt4-crystal" command but no luck.

Monitor: Samsun LCD 1280 x 1024 @ Max 75 Hz
VGA: ATI 4870 X2

Thanks in advance.