All motherboards boot to Auto for all hard disks this leaves it to the BIOS to get the data from the hard disk. It has to have a video card in tho as this is one of the things the system will require you will get a post warning telling you there is a video error this could be one of the reasons it wont start.
As everyone has said check all cables and jumper settings.
As everyone has said check all cables and jumper settings.