The line should read "Loading /lib/kbd/keymaps/i386/qwerty/us.map.gz" and it would be odd to have it hanging there unless there's a problem with 'loadkeys' or the configured keymap file itself. It would be more common to have it hanging for the next item: setting hostname. If you still encounter this problem see if you can boot the machine into runlevel 1 OK (grub, enter menu for kernel of choice edit kernel line and add " 1" at the end) or use the installer CD in rescue mode and boot the system with that.
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