just installed my alpine cva-1003 and i can not get ta picture on the screen i know it works i get the tunner screen but when i put it on aux i dot get a picture it is all black i get sound its hooked up to the e brake and foot brake and the moniter is off for your safty isnt on cant figure it out aux is on and switch on the bottom of the mmm is set to norm am i missing somthing or is my mmm broken:( 