experia z3 doesnt work

[tomasss]

tuchscreen is dark but I ve heard messages tones and alarm but displey xperia z3 off, 6 monts old phones....pls help what can i do if it isnt my falt but technical probs??

[Phy]

repair the phone with PC Companion.
http://support.sonymobile.com/gb/tools/pc-companion/