I just drained the battery on my galaxy s 4 and when i plugged it back into the charger, it refused to turn back on and vibrates about every 4 seconds. I've already taken the battery out and held down every combination of buttons but nothing is working. the most i get is when i hold the power button the startup screen appears for a few seconds and then goes away. I desperately need help, and would be grateful for any advice. also if i leave it plugged in for a while a grey battery bar appears for a few moments but then goes away.