I had this problem and I just kept playing with it. When i would take out the battery and put it back in I would get that quick vibrate like it was gona turn on, but then it wouldnt. And when i plugged in the charger, nothing happened either. So i took out an put in the battery again, and when the vibrate came, I plugged it in. The I would get the charging symbol, but then it turned off again. So I kept doing that and same thing. Then I tried the 30 second thing with the battery out, and when I put it in, the Galaxy logo thing came up, but then it turned off. Then I did the vibrate thing again, and when i plugged it in, it was charging. Then I held the power button and it turned on.