My phone was losing its charge and a screen came up telling me to charge it. I immediately plugged it into my charger and still after almost 6 hours I cannot get it to turn back on. When I unplug it and re plug it in again I get a white light in the upper left corner that very briefly blinks then nothing. I have tried to try a different charger that I know works, tried several different outlets in my home and still nothing. I also tried holding the power and volume buttons and still nothing. this is my only phone. Any suggestions? Please help