You have an Intel chipset. This was the log from the Live image and not from your install <> But it helped to see what it did boot up on...
Originally Posted by linux.girl
Booting from the LiveCD it boots up sucessfully using the xorg-xorg-video-intel driver and displays fine.
Somehow in your install, it isn't finding that driver on it's own like it should.
SO... While booted from a LiveCD. Go to Places > This time ensure you can find the drive/partition that you installed Ubuntu to... You should be able to find it under "Computer." This is important that you find that instance and open it in. This will mount that filesytem.
Now go to Applications > Accessories > Text Editor > New
Cut and paste the below into it and save ibto /etc/X11/ as filename xorg.conf.
This was created using the values from your xorg.O.log where it succesfully booted on your hardware. The driver section points to the intel driver so that it doesn't have to guess.
# Created for linuxgril
# Revised 2011.19.10 MAFoElffen
Identifier "Configured Video Device"
VendorName "Intel Series 4 IGC"
# This is the monitor section the Princeton Monitor.
Identifier "Configured Monitor"
ModelName "Model: 899 Serial#: 16843009"
HorizSync 31.0 - 80.0
VertRefresh 56.0 - 76.0
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"