After installing latest Debian distribution(Wheezy) while starting for the first time GNOME 3 crashed. In " System settings " -> " Graphics " -> " Experience " value was " Fallback ". Solution to fix this problem with my graphic card(ATI x1250) was found on: https://wiki.debian.org/AtiHowTo#Installing_proprietary_firmware Mainly install proprietary firmware: sudo apt-get install firmware-linux-nonfree And reboot PC. Now in " System settings " -> " Graphics " -> " Experience " value is " Standard ".