Why doesn't my Xperia M power up?

[Elisa bas-il]

My Xperia M doesn't power up

The problem started when i installed an update on the android. When my phone warned me to at least have a 50% of battery inorder to install the update, so i charge it without my knowledge on what happened next because i left it and after an hour, i just observed that my phone has no signal of being charged.. I tried to power on but it did not worked until now. I tried to repair using the PC companion but it is not recognized by my computer. I tried using somewhat battery loop.. pressing the vlume key down + power. it didn't also worked.. Please help me what to do

 

[Elisa bas-il]

Re: My Xperia M doesn't power up

There's a development on my phone.. yesterday it cannot even charged or no light signal if i connect it to outlet. But now i can see an on and off light while charging. it light at first minutes and shut after sometimes