Hello Guys I have tried everything possible to boot the osx 10.9 to no avail. I have tried all the boot flags like (-V -F, ) ,(-F) , ( -V) and even try it without boot flags ,all of them no way. I have deleted all graphics kexts that i don't need still no way. K56CM. HD4000, nvidia 635M 2GB , have anybody already tried it lithesome laptop.please let me know .I will appreciate any ideas . Attaches is the picture of what i got from booting with those boot flags . Thanks