You can open the badboy up and see if the fuse is blown. If you had a DMM, it would be helpful. That way you can check to see if there is voltage coming out of the adapter, and if so, if it is still there after the fuse.
That Radioshack adapter should work, since it is 9v 1A. I'll keep trying to look, but I can't seem to find what adaptaplug you need. I thought I found it at one time though.... Worst case, take it with you to see if they can match it up.