I'm almost throwing in the towel. I tried and did not work well. Even when I was almost giving up, I used a boot disk with the third option "mach_kernel" and got into the installation process. I realized that the Lion is actually a lot heavier than the SL, but the application that I use requires a more current, and realized that when installing the update 10.6.8 SL on the system loses all configuration, video, audio, network and etc.. Now I have 2 solutions, or discover a cool upgrade for the SL 10.6.8 without losing system settings, or do an upgrade to Lion run better, and find a certain problem with the brightness level. In the BIOS is set to the maximum level, but upon entering the facility he lowers the brightness level and I can not increase. I am very grateful for your support, and I wonder how do I be a support for the project Latitude OSX, because here in Brazil we have thousands of users who wish to make a Hachintosh on your Dell equipment. I would be grateful to be a developer, systems analyst I am available to be a supporter. Thank you once again.