Oh, one more thing:
> The entry should look like this:
>
> menuentry "Debian 7.0 wheezy installer, x86_64" {
> linux /debian_iso/install.amd/vmlinuz priority=low vga=788 --
> initrd /debian_iso/install.amd/initrd.gz
> }
This will set the installer to "expert mode", leave out priority=low to
avoid that.