My system is not working any more

I applied today's updates and after re-booting my laptop is not starting any more graphically.I get only a flashing screen and I am using an intel graphic driver. I do not know how to recover, just for info, I started my system in runlevel=3 and then I issued a startx but nothing happened. At a first investigation, I didn't find /usr/bin/system-config-display ..... What happened?? and how do I recover without re-installing??? Another system with same updates but with a different graphic card is running fine... -- Antonio Montagnani Skype : antoniomontag