My Xperia S turned off by itself and now i can't turn it on

[#1]

Hi all, i am really in a mess with my phone turned off by itself and wont turn on anymore. i bought this for only two weeks!

It went into a slow motion phase it started working realy slow and then it just turned off now i simply can't turn it on 

Itried to use the repair phone option using my pc compagnion and i followed all steps but it simply wont work its a dead phone right now.

So anybody a little help please

[perlaac]

hi ! im sorry to bother, can anyone help me with my ION?? i tried to update but it turn off and it wont start again... i connected to the charger and the LED turn to red and after a while it turns on, the SONY screen shows up but it reboots and it goes on like 5 or 6 times more then dead and just the led again, so if i keep it plugged it does the same again and again ...