1) OS: 11.04 64bit
2) Make: ASUS
3) Model: N55SF
4) Issue: LiveCD fails to start

hit F6 to alter the boot options and added
nouveau.modeset=0
to the end of the boot options line and then hit enter.

This forces the use of the build-in Intel GPU instead of the 2nd NVIDIA 555M (Optimus) GPU. (Many thx to previous poster!)