Unable to install 12.04 on HP Pavilion G6

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http://askubuntu.com – I am using USB memory stick to install Ubuntu 12.04 in my HP laptop. It has 1GB ATI Radeon graphics. As soon as I click install Ubuntu or run Ubuntu, the screen goes blank. I tried to open terminal mode using: Ctrl+Alt+F1 But that didn't help. Does anyone have the same problem? How do I resolve this? (HowTos)