if the problem persist when ur backtrack installed on ur hdd;
1. Boot in to backtrack terminal (Just turn on the computer).
2. Log in to root.
3. type in "vim /etc/default/grub" (no quotes)
4. find a line that looks similar to this: GRUB_CMDLINE_LINUX_DEFAULT="text splash vga=791"
5. Move your cursor on top of the last quote on that line and press the
letter 'i' on your keyboard (this turns vim in to inserting mode)
6. Add a space between vga=791 and the quote then type in i915.modeset=1
(The new line should look like this: GRUB_CMDLINE_LINUX_DEFAULT="text
splash vga=791 i915.modeset=1")
7. Hit escape on your keyboard and type in ':x' (with out the quotes..
Just hit the keys) and press enter. This will close the editor.
8. In your console type in 'update-grub' (no quotes)
9. Wait
10. Restart
11. ???? 12. Log in to root, and type in startx...
Then
apt-get update
apt-get dist-upgrade
startx