I have a Samsung Instinct through Sprint. It was working fine this morning, but then it shut off and now it won't turn back on. The battery had a full charge when it shut off. If I try to put it on charge, the screen that shows it is charging comes on, but the phone itself still will not power up. I was hoping to get some suggestions for things that I could try at home without having to deal with the hassle of going to a corporate store...and suggestions are appreciated!