You can enable the bootmessages, so you can see on your screen what happens, and where it stops.
At the grub menu screen, press 'e' to get into edit mode, and remove the word "quiet" and change "splash" to "nosplash" on the kernel line.
oh and bootchart do you download that at the terminal?
Download the deb file from
open a terminal
cd to the directory containing the file
sudo dpkg -i bootchart_0.9-0ubuntu6_all.deb