hi i needed some help with the iphone 4 i am running os 4.1 i recently changed my screen and now my cameras don't work i have checked all the connections inside the phone but i cant seem to find anything wrong with the installation of the screen. I reset my phone through general>reset>reset all settings this made my rear camera work but when i switch to the front camera it freezes then to it all stops working again i have to reset it again just to make the rear camera work again, can anybody help me i don't think the phone has warrentey seeing i opened it any help will be much appreciated