Power button does not respond to wake up

[FaZack]

i had some issue about the power button. it does not wake up the phone when i press it but the power key is pyhsicaly normal and in good condition. i had update my xperia z to android 4.4.4.. i need to connect to the usb power supply to wake the phone.. when i at the outdoor i cannot use the phone bcoz it does not wake up,. i had use some way to solve the problem. i had restart, press the volume up and power key.. please help me:smileyworried:

[Thommo · Accepted solution]

Try performing a system repair as this will often fix issues after an upgrade - This will factory reset your phone

Switch off your phone and unplug from Pc (Hold volume up and power for around 10 seconds)
Start PC Companion and select Support zone then Update my phone/tablet then in Blue Repair my phone/tablet and follow the onscreen instructions - When prompted connect your phone still switched off holding volume down or back button - This should start the repair or reformat process

If you are using Windows 8/8.1 or a 64bit operating system then adjust the settings for PC Companion and run in compatibility mode and chose Windows 7 or XP

[FaZack]

It works but all my apps gone, anyway thanks a lot. Love Sony..