how do i get rid of black screen on iPhone simulator

im makg a game on Xcode for iOS buterytime i try to run the app the iPhone simulator goesBlack could still see the app icon but not the applcation it self it l team fixes this problome to lauch it n the near winter. We have it updated to iOS 7 SDK but that still hasnt soved the problome as well as resting the iPhone our only wa of ning the app is to upload it to an ipod 5 but i want to hare the progress by screen share using OS X server scinc my team is scatterd all around town. So please reply to any remody to this problome im sure im not the only one.