Also, you could use the command "XFdrake" at a console boot, and then it will start the video configuration. This has saved me on many times when I had video driver problems when booting. Add a "3" to the bootline and it will take you to a console boot, so will the "Safe Mode", I think, but I have never used the safe mode, yet.
Note: it is case sensitive. The command is XFdrake and not XFDrake.
Desktop: AMD 3.6ghz X4, Gigabyte MB, 8GB ram, Multiple PCLOS's, 188.8.131.52-pclos3.pae.bfs
Server: Intel 3.4ghz X2, 4GB RAM, SATA, gnome2, *.pae.bfs, Headless, Servers: LAMP, FTP, Samba, Print, PXE, BT
HTPC: Phenom II X4 2.8ghz, 4GB Ram, 1TB SATA, PCLinuxOS-KDE, NVIDIA N220GT HDMI, *.pae.bfs