ok so I've had this phone for like 6 months and never had any problems with it til today, I was on the phone with someone then when they hung up and I was trying to hang up the screen went very dark and dim to where I could barely see it so I turned it off and on and it just loads the galaxy S logo and verizon logo then It's completely dim again and the home screen only turns off for 1 sec then goes back to sleep mode. I've tried restarting the phone, taking the battery out and putting it back in, holding the home, power and volume up button and it won't work. help?!?