My Sony Xperia j won't start /turn on

[adka]

Dear sir/madam

my xperia j is not turned on when on mu mob. it appears sony logo and " XPERIA" only after nothing happening i tried somany times remove battery and restart , charged fully , not responding any button start button vol.up/down 

p[lease help me

thanks

Sachin

[_alexdon_]

Keep it charging for 2 hours,repair with sony update service after.