looks like http://bugs.centos.org/view.php?id=4363 to meI've a toshiba satellite notebook, and I tried to install centos 5.6. The installer starts, but when it turns to graphical mode, the backlight goes off. I see the windows, buttons, but it's very dark, maybe the backlight switching off..Ok, I rm the xorg.conf file. After I start immediately the X server, the screen was visible but only in 800x600 resolution. I tried to change it, but there is no other modes available. So I get back to console and try s-c-d, then start again X. The backlight went off again, so I returned to the original problem.