help...help...my phone's bust....

I own this sony Ericsson's K 510i phone. Last evening I took a lot of pictures and the camera showed a message saying capacity full. So I deleted some previous pictures and took more pics :)
Then it seemed ok. But later when I took it out of my pocket, the display screen was white !! Just this blank, blinking WHITE !!
I tried switching on and off but it didn't work. ... Still white blank display....Then I went home and connected it to the computer and saved the photos I'd taken in my comp and deleted them from the phone. Now there are only around 6 pics. This is less than there was at the beginning.

But still the display doesn't come on!! Once or twice the normal screen came, but it converts back to the white blank screen in about 3 minutes. I did take out and insert the sim again....no go...

Can someone help me....Please please..... Is there some way I can get back my phone?? whats wrong with it? Oh help....

What about my msgs and tasks and contacts and videos and sounds etc.... Will they all be deleted ?? Please help....Now when I try to connect to it by computer, I cant find it.....Its nonexistent!!!
Aiyoooooooo :( :( :(