Ubuntu 12.04 not booting from usb

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http://askubuntu.com – The Hp pavilion g6 notebook is unable to boot from bootable usb stick. I was able to boot other systems using the same pendrive. I have changed the boot priority using f10.so when i restart my m/c it doesnot asks for any message like "press any key to boot from" When i press f9, and select my pendrive from the available options to boot from while restarting it gives me a message. error while trying to boot selected boot image. Though i looked into the possible suggestions here, none of them worked. Looking for any help? Edit: I have used linux live usb creator (HowTos)