Installer mountain lion can't boot on samsung rv510 #iATKOS #ML2

Hi,



I can't install of mountain lion from my usb. I'm under lion 10.7.5 now. I've tried unibeast, my hack, niresh 10.8/10.8.2, iatkos ml2, but i can't access to my installer screen. When i choose usb in the boot loader, my pc reboot :(







I'm arrived one time to access at the installer but it required usb keyboard and i don't have it :(



The problem is that i don't remember how i've done for access at the installer...







How to install mountain lion on my pc ?



PS : Maybe the pb is the graphic card...







My config :



Samsung RV510



Graphic : Intel gma 4500







Thanks in advance :)