How can I fix my Sony Ericsson W300i? It won't turn on anymore?

This phone is new and has barely been used at all. Not even the Walkman on it. The S/N - IMEI is 35384001-447327-8. One day it worked and the next day after charging...it wouldn't come on. Now when I plug it up to charge, the screen on the front and back, blinks a blank screen but a slow steady blink. When I try to turn it on, the keypad lights up, along with the blank, blinking screen and it does a very short, quick vibrate every time. What do you think has happened? Is there anything I could try to do to fix it? It hasn't been near any water, nothing different installed, added or activated; such as bluetooth, etc.
Please help or give me something that I can try to do myself.
Sincerely,
Tim Hall