Xperia Ray :: Screen Is Not Showing Anything?

i bought a brand new xperia ray few months ago. it was working very fine, i was watching Internet videos on it, that suddenly its screen stop showing any thing. also the buttons lights are not showing up.i had tried these things remove and re-insert the batterypress the power button for 5 secondsremove the battery and then press power button for 3 seconds i read all those on net, but nothing works for me. the screen is working in terms of touch and interaction. it does not show up any thing, but if i swap or touch the screen with my senses its works. e.g. when i got a call, its bell got ring, and if i swap the screen specific area call get attended.