Sony Ericsson W910i wont charge or turn on?. Hi my phone wont charge or turn on (SE W910I

Question

Hi my phone wont charge or turn on (SE W910I )

Every so often the screen comes up with charging but is battery is fully gone, then goes onto black screen, I have left it charging for two days and still nothing. It did keep coming up with a red light on the back at first but now nothing?
Any much appreciated
Emma