Ubuntu 12.04 live CD boots to black screen

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http://askubuntu.com – I am trying to install Ubuntu 12.04 on my Laptop (Intel Dual Core/Nvidia Graphics). I am able to boot from cd and I reach the purple screen (here) But after this screen there is a black screen with a blinking cursor. I have seen all the similar topics but haven't solved it yet. I tried these instructions on the installation topic My computer boots to a black screen, what options do I have to fix it?), but still... I also tried to install 9.04 and 11.10 versions of ubuntu (i have the cds) but the same happens. How do I cope with it? Please help me. (HowTos)