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
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!)