Xperia U not starting/charging

Since some days ago my Xperia U is not starting, i guess from not charging.Also the red/green led doesn't light up at any time. I tried:- removing the battery, for extended periods of time- charging for long times, i let it charge for like 2 days- charging with other chargers- flashboot or whatever it's called, with volume button down and/or up- repairing with PC companion app, but it doesn't recognize it Are there any other ways to make it work? Or is the battery/phone done.  I have to mention that something similar (if not the same) happened like 1 year ago.But i think the red led was lighted that time, for atleast 1 second.Don't know how i got it working, but after some days it started normally.

Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.
Sorry to hear about your phone. I suggest that you try to repair/reinstall the phone software using Sony Update Service. 
Download the program and follow the instructions to update the phone, you will connect the phone wile it is turned off: 
http://www.sonymobile.com/global-en/tools/update-service/
If the issue still persists, I would suggest that you have your phone examined by a service center. Please contact your local Xperia support team for more information:
http://www.sonymobile.com/global-en/support/contact-us/
 

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