BackTrack 5R2 KDE 64 HDD installation Problem

i've spent >3 hours finding out why the screen went blank after startx... thought it was something to do with the KDE or something. tried to startkde just to prompted as "$DISPLAY is not set or cannot connect to the X server". at some extent it looks like i'm going to stick with ubuntu11.... BUT....

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... Alhamdulillah!!!!.

credits to BugMe