Virtualbox may have problems booting Mac OS X if your computer uses an Intel Haswell processor (i.e. if your computer was built/bought in 2013 or later). If this is this case, you will have to trick Virtualbox into thinking that your processor is actually an older model

here is the trick line :
VBoxManage modifyvm Name of virtual machine --cpuidset 00000001 000306a9 00020800 80000201 178bfbff

you can get download link here ,
thank techreivew

https://www.youtube.com/watch?v=kUfVqGceLQM&list=PL0q4CTVJvabCunDY7KVP6dNI7Ia4pziWA&index=1

Share the video, if my video could help to deploy macosx 10.10 on you Virtualbox
it could save many people from getting mad while trying to install mac osx 10.10 yosemite just like you and me

Buddha taught: " Saving a life is move valuable than building seven towers "

if you get trouble on the second boot
watch this video
http://www.dailymotion.com/video/x3izuza

Thank you for watching