|The hard drive selection is not part of the boot order screen. Look further back in the BIOS for that selection. Name may vary but it is which hard drive to choose as the first boot device.|
You MAY also be able to get to that selection by tapping an f key at start up. May be something like F11. Watch the screens for a message to change boot options hit ?.
The first method is probably the easiest. Just remember the boot order just says hard drive. Not which hard drive. Now that modern systems can have 8 or more installed drives that selection was added.