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I installed Ubuntu 12.04 on my Laptop hard drive from bootable USB and now when i took it out and restarted it, its just showing a blinking courser and when i plug the Same USB back it works.

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It looks like you'll need to edit GRUB (the bootloader for Ubuntu.)

Please look here -

And more specifically here for more information on how to edit GRUB to do what you need it to -

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