I had same issue but finally I solved it.first boot your computer with usb unibeast.Than use option top of the Yosemite icon installed one write safe boot command -x.it will give the mach_kernel error than ask you to press any key.than comeback first section now select the install Yosemite icon...
Article: OS X 10.9.5 Update
For Hp Probook this upgrade is very simple.Just upgrade it like normal.But before you beginning the upgrade"BE SURE MAKE THE BACKUP".
Step 1:Restart and Install for upgrade like regular way or combo update. I did with regular way.
Step 2:Put your Unibeast Flash...
I got so much stress I cut all my grass in my yard.Watch 10 funny movie and I am all about the go to buy MAC BOOK PRO.I bought this laptop because many people saying so easy to install snow leopard fast boot blahh blahhh.I follow all the guide after update 10.6.8 my screen show gray screen,black...
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