okay so i had my samsung captivate charging and i turned it off while on the charger. i went to turn it on and screen lit up and did everything like normal but when it was time for it to show the home page my screen went black. The four buttons on the bottom of the captivate light up though, but when i click them nothing happens. and it vibrates like crazy. Ive turned it off and on many times and it does same thing everytime. how do i fix this?