I have a Sony Ericsson

I have a Sony Ericsson k810i phone since April 2008.Today I connected my cell phone with my pc via usb connection.My phone was turn on and I had choose the "operate as a cell phone" application on the screen menu that has appered!My k810i was charging from my pc via the usb connection.When I remove my k810i from the usb cable, suddenly the screen went white!I tried to turned off my phone by the power button , but it wasn't responding and the screen has continued to be white.Then I had taken off the battery and the screen then has turned off! I replaced the baterry and try to turn on the k810i phone but it didn't. Then I tried to charge the phone and to turn it on when it was charging, but nothing!When it was turned off and charging,it hasn't appeared any red light nor the charging message on the screen. I pushed the power button many times and more than 10seconds continuosly but nothing again! I downloaded the update service and try to update the k810i , followin the lines of orders but I believe that the update has failured! I followed the orders that apear on sony ericsson internet site for this dysfunction (eg remove and put back the battery) but it didn't happen anything.My cell phone is dead!No sign of flashing life! Any suggestions?
Thanks a priori!
PS I have an m2 with a copy of a major part of my contacts and photos, but some others I haven't save them yet, can you help me by suggesting me a tip how to save them now, or is too late?