Install Mountain Lion on my XPS l702x impossible usb boot

[supersonic_32]

Hi everybody! I'm new in hacintoshs and i have a reaalllly dumb problem. I've got a XPS l702x with windows 7 and i want to install os x on it, but i can't ever boot the installation.

 

When the computer starts, it says "operating system not found". All my settings in BIOS are right, i've got no UEFI. I Tried to created my usb stick with [url="http://www.insanelymac.com/forum/topic/279450-why-insanelymac-does-not-support-tonymacx86/"]#####[/url] and myhack on virtualbox with my genuine app store image of 10.8.5. Installation of [url="http://www.insanelymac.com/forum/topic/279450-why-insanelymac-does-not-support-tonymacx86/"]#####[/url] or myhack is succesfull, i really just can't start on usb... I even tried to follow multiple guides for [url="http://www.insanelymac.com/forum/topic/279450-why-insanelymac-does-not-support-tonymacx86/"]#####[/url] or especially for l702x, don't work.

 

Does someone ever encounter that problem? I know that when it's a windows stick, usually this message comes up when the partition on stick is not active, but now I don't know if it is or how to make it on OS X. Hope one of you can help me, thanks!