grub> promt when installing Solaris 11

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http://www.unix.com – Hi, I am trying to install Solaris 11 to my new Intel DN2800MT motherboard with an integrated Intel Atom D2800 CPU. I am installing the OS using an USB image downloaded from Oracle web site (e.g. Oracle Solaris 11 Downloads) and prepared using the Solaris usbcopy utility. When I select to boot from the USB stick, the machine displays a prompt prefixed with "grub>" and only allows me to run a few (about twenty) commands - cat, find, setup, install, splashimage, and other. It does not even allow me to do ls, or format, or fdisk, or installgrub - I cannot even find out the i (HowTos)