http://www.newegg.com/Product/Produc...scrollFullInfo
Just checked out your mobo, looks like others have had problems getting the 24pin in snug, make sure yours is in all the way. The board might not be getting a full connection and is shutting down due to voltage issues.
I also have an asrock mobo I just got recently and i've been having ALOT of issues with it (60 days later), took a chance buying a brand I wasn't comfortable with but was a bit cheaper, paying for it now. (granted plenty of other people have had no problem with them though)