First of all you should check your CAPX image memory to make sure that it does not exceed 100 mb. <<< This tends to be even larger on a real device.
Second, black screen could be a multitude of reasons. I found that checking the 'Use XDK Format' tends to get a black screen so I uncheck that box and create the 'www' folder myself.
I also found that having a certain combination of C2 plugins with XDK-fetched plugins tend to end up black screen as well.