Black Screen when Booting Ubuntu on Asus Netbook

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http://askubuntu.com – I tried installing Ubuntu on my netbook through a bootable USB a few days back. After installation I happened to use Ubuntu for quite some time and later shut down my netbook. When I tried booting the netbook again, it just shows a black screen with a blinking cursor after the initial Asus screen. I tried opening BIOS by pressing F2 but it ain't coming either. What should I do? (HowTos)