So I hooked up subs to it today and they were working great,stopped the car for a minute and not the car speakers dont work...just all sound the subs work fine,just the speakers dont come on???and when they do work when I turn it up the screen flickers and its not from bass just the doors soeakers and tweeters.Its the cd/dvd/screen combo.Anyone any idea why any help would be greatly appriciated.Thanks...