It just failed to start. You might be able to reset your CMOS. This requires you to get frisky with a screw driver and open the case to locate the CMOS battery or the jumper that will reset the CMOS. Warning this will void the warranty. You might be able to get a repair shop to do this for you.
Worst Case: (lets hope not)
You bricked it; J-TAG time. J-Tags are great fun. You may have to call the manufacture of the mother board to get the j-tag diak and you will need a computer with an RS232 Com Port and a j-tag cable for your mother board. Then you can reload the BIOS. Most people just buy a new board. This will deferentially void your warranty. Some repair shops have the equipment to do this for you.
If you have a warranty still, I would call the manufacture and DO NOT TELL THEM WHAT YOU DID and act like it just failed one day. They will replace the system with a new one and hopefully swap the hard drive out. Again flashing BIOS will some time void your warranty so I would not mention it.
* If you decide you want to go this route, do it before you do the above so that they do not see that the case was opened. *
Either way you are probably going to need to call tech support for what you need.
Good Luck and from some one who has his fair share of bricks under his belt, I feel for you.