As i can see your graphic driver is not been detected did you type:
$ start x from console ? does it work?
If doesnt make sure you have generic vesa driver in Xorg configuration file.
$ sudo nano /etc/X11/xorg.conf
seek for a line containing your driver...if have nvidia or ati seek for those names...for example if you have an ATI Radeon just replace Radeon for vesa in this example list:
Identifier "ATI Technologies, Inc. RV350 AS [Radeon 9600]"
Option "UseFBDev" "true"
Driver "radeon" or Driver "nvidia" you should replace it for "vesa"
then in nano save the file with ctrl + o and exit with ctrl + x.
Restart and it should load Gnome