I just recently recieved the 7710 from my friend to sell on Ebay. He gave me everything in the box and last known it was in good working condition. I took it out of the box to turn on to take some pictures of, but to my suprise it didn't turn on! I hit the power button and the screen flashes white but nothing comes up. I put in my Cingular sim card and the 128 mg media card that came with it but nothing! I tried taking out the battery and still the same thing happens. I tried plugging in the AC adapter and trying to turn the phone on like that but NOTHING! Help!!