phone will not come on
phone was working fine. One day wouldn't charge inspite of being connected to a power source. Eventually phone wouldn't come on at all. purchased a new battery and put in the new battery. the phone came on and I was able to use phone for about 5 minutes. Put phone down and went to do something else. came to use phone. touched the power button as normal to bring up the screen. Nothing happened and cannot get the phone to display at all even when attached to a power source. Even when using different chargers in case one charger is faulty. What is wrong with the phone?