Display is black

[DavidLim]

Just as the heading said, my phone is plain black, it has already been two hours, somebody please help me

[Uliwooly · Accepted solution]

Press and hold power & volume up for 10 seconds 

[Uliwooly]

If that doesn't work then 

repair your phone with PC Companion (PCC) 

if that doesn't work then 

Connect your phone to a wall charger > press and hold power & volume up for 10 seconds > let your phone charge for 2 to 3 hours > repair the phone with  PCC

[Uliwooly]

PC Companion (PCC)

Bridge (for Mac)

Alternatives on How to backup Xperias

http://talk.sonymobile.com/thread/36355