Ubuntu 12.10 64bit installation on HP Pavilion g6

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http://askubuntu.com – I have been trying to install ubuntu 12.10 - 64 bit in my system with the following config: HP Pavilion G6 Windows 8 - 64bit 8 GB RAM Intel Core i5 I have read a number of articles on internet talking about the it. But the problem with me is I am unable to boot from USB, CD in any case. I have disabled the secure mode settings, and set the correct boot order. After that it never recognizes by connected Flash drive or Live CD. It always boots in windows 8. Any help is appreciated. Please let me know which step I am doing wrong. Ref: Installing Ubuntu on Windows 8 Secure Boot in Windows (HowTos)