Possible Duplicate:
My computer boots to a black screen, what options do I have to fix it?
Windows 7 is already installed on my system and then i tried to install Ubuntu 12.04 from a USB drive made with LILI program.
Now I am getting black screen or if I use other modes from F6 menu, I get error. How can I install Ubuntu on my system now? please give me a detailed step by step solution.