1) Mcc? I don't know what you mean, mandrake control centre?
2) Try to diagnose the problem before changing permissions at random. Open a terminal, type "su" enter root password then:
less ./messages # type q to quit
use up/down arrows, pgup/pgdown & home/end keys to view your system logs. All the entries are time stamped so you should be able to scroll to the point at which the problem occurred.
Also look at (in /var/log/):
less ./Xorg.0.log # X server messages
Another handy one is "dmesg", for your log since last boot:
dmesg | less # (from any directory)