Hello, For what OS version will these driver be working? I got the arrandale / intel integrated / Radeon HD5000 (ATI Madison) in my HP dv7-4177 and would like mountain lion on it. Install disk don't even boot.. What's possible to do ? i used myhack to put the retail install on a usb stick. thanks for any help, maybe just a link, one of you propably felt onto a "local apic KP" as i do, whatever the parameter i enter on chameleon? Thanks to save me time, i suspect some myhack parameters to be able to solve my problem, but i don't find which!