I just bought an Area 51 site 4 board advertised as working. I plugged it into my Sega Blast City with standard Jamma and all I get is a black screen. I hear the hard drive spin and the red LED on the board lights up. Am I missing something? I hear an occasional faint clicking and each time the screen pulses slightly. It's listed as Jamma + so I am not sure what my Blast is missing. I don't have guns yet either. Thanks for the help.