Install/Boot problems after dual boot of Linux Mint on HP Ultrabook (Envy 14 1030us)

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http://askubuntu.com – I have followed the excellent steps to install Linux Mint (as dual boot) on an HP Envy 14 ultrabook (1030us) as detailed by Raphink (Dual boot Installation of Ubuntu 12.04 LTS on HP Ultrabook ENVY-4 1002TX) but am stuck! I have gone through the installation procedure twice following all of Raphink's advice however my system will not boot into Linux Mint, or Win7, and all I see is a very primitive menu with a grub> prompt, not the grub menu which provides the option to start linux. When I boot into Linux Mint from my usb thumb drive (by turning the machine on and pressing F9 periodically), I (HowTos)