X won't work after graphics card update
I'm running Mandrake 10.0 Official on my box for some months now. Yesterday I changed the graphics card and replaced my Matrox G450 with a Matrox G550 and now X won't start. It flashes a blue background with a non-movable X mouse cursor a few times and then stays with just the blue background without any mouse pointer. I can't stop X with Ctrl-Alt-Backspace, but Ctrl-Alt-Delete will reboot the box just fine.
Sometimes it gives me a console after trying to start X, so I logged in as root and run xf86config, trying the "mga" driver as well as the "vga" driver which some google result listed as a failsafe setting, both unsuccessfully.
Is there a way to start the Mandrake configuration tool which is used at the end of the installation to setup X where you can set the type of card, amount of memory etc., either graphical or ncurses-based? I would hate to have to reinstall the whole thing just for the stupid minor hardware change.