Is this a completed system you purchased or a new build? I am confused by your description. I any case, the items to review are similar.
Good news - the THG forum has a stickee to use when you have new system boot issues:http://www.tomshardware.com/forum/261145-31-read-posting-boot-problems
Bad news - you did not reaid it before posting.
Even if a new system you purchased rather than built, it might be something as simple as a wire coming loose during shipment.