My Wife's Phone has started giving problem. Phone was working at night. This morning the phone wont start. Connected the phone to charger but there was not display that its charging. Removed battery and re inserted it. Samsung Logo appears for a second on plugging the phone and then the screen switches off. Same thing happens if the battery is plugged in when the charger is already connected to the phone. However this time its the battery charging symbol and again the screen goes off. The phone was stock. I have tried putting the phone is download mode and pressing home + volume down + power button however this time also screen shows warning and again shuts off after a second. Anybody know what can be the problem?