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Hiya,
Ive had my Xperia U for quite a while now (Sept 2012), and have had a recurring problem. My phone would sometimes freeze on a grey screen, and the only way to fix this would be to take out the battery and leave it for 24 hrs. But the same thing happened to me a few days ago, but i cant resolve my problem.
The screen is completely blank, even when connected to a charger (USB and Mains), when connected the only response i have is a red light. But the phone will not turn on or connect to my PC, and i am in DESPERATE need to transfer my data to my PC so that i can send it off to be corrected.
If anyone has had this problem before or knows of a way to fix this, please get back to me.
-Jac
try this
connect your phone to the wall charger > press and hold the power button & volume up for 8 seconds > let it charge for an hour then try to turn it on.
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you can repair your phone with SUS
SUS
http://www.sonymobile.com/gb/tools/update-service/
http://www-support-downloads.sonymobile.com/Software%20Downloads/Update_Service_Setup-2.11.12.5.exe
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
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