Hello i have a 4540s mavericks, its was hard because i dont know nothing of osx.
I can help you
first its put the opcions of the bios like the tutorial
Second boot with the flags like the say above, its must be identical like its written above
respect the mayus and minus letters
the screen whithe thats appear its normal, because you force the shutdown, nothing to worry
Install w7 and mavericks with dualboot, and get me a 1 day with 3 reinstall to work the charmeleon boot, are putting dual boot ??? Let me know to help you