OS wont appear, your hard drive will be shown by name, you need to be sure to move it to the top of the list
This is in advanced BIOS page, then inside the top setting on that page called Hard Disk Boot Priority, you have to push enter to go into the next section there and then move the drive to the top of the list.
*edit*
Also, please verify the XP install disc version you are using, because if it's not SP1or later it's not going to work at all.