Wow. It's been a loooong time since I've posted here.
Anyways, I pretty much got the same problem.
I was using my 200N one day when it just shuts off which I assume was due to overheating or something.
When I tried to boot it up again, the fans whir up at less than half their normal speed, and I believe the drives started up (but I'm not sure).
I just left it for dead. It was a huge pain anyways. I had to reset the BIOS almost every cold boot.
It would be great if you could revive yours, but I doubt it is going to happen. Biostar did not build the 200N with quality in mind, IMO.
Sorry to sound sadistic, but I'd start looking for a different board and case to put all your stuff in.