I beleive that the issues with the A505, specifically A505-S6033 are caused by the kernel. I just installed by usb method using myHack and the 10.6.0 disk with the chocolate kernel. After install I immediately updated with 10.6.4 combo update and reverted to multibeast as I like it better. I believe that you could just use iboot to start with IF you use the 10.6.3 retail disk. It has kernel support for the newer processors. I dont know if usb will work that way though. My install on A505-S6033 is perfect, just trying to get audio and wireless.