K510i Sony ericcsson problem with display

Ericcson K510i display problem? I own a sony ericcsson k 510i phone. Last evening I took a lot of pictures and the camera messages said capacity full. So I deleted some previous pics and took more pics. Then it seemed ok.
But later when I took it out of my pocket, the display screen was white !!
I tried switching on and off but it didnt work. Still white blank display.

Then I went home and connected it to the computer and saved and deleted the photos I had taken. Now there is only around 6 pics. This is less than there was in the beginning even.

But still the display doesnt come on!! Once or twice the screen came , but it converts back to the white blank screen in about 3 minutes. Can someone hlep me....
Please please..... is there a way I can get back my phone??
what about my msgs and tasks and videos, sounds etc... Will they all be deleted ??
Pls help....
thank you very much