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Hello friends, the power on/off button of my xperia z ultra doesn't work with less than 1 mouth!!! I can't turn off my cellphone(thank god he was on when this mess came up). Somebody know a way to fix that? maybe some software problem came in, i don't know.
Solved! Go to Solution.
What if you press and hold power & volume up? if that doesn't work remove the SIM card that should restart the phone, there's also a button next to the SIM card, you could reset the phone with that button.
You could repair your phone with PCC
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
Press and hold power & volume up doesnt work. I don't have a sim card yet, so i cant try the second sugestion. This button next to SIM card only turn off the phone or reset it too? Only turn off him isn't a good idea i think.
i am starting the PCC repair here, as soon as i can i post the results.
reset button doesn't work. PCC software doesn't work. 
yes, it turned off, but now it don't turn on. probably it's a hardware problem, unfortunately.