If your computer recognizes your phone when you plug it in, you may have a problem with the lcd screen.
When my Sony W810i had the white screen problem, I was about to buy a new phone when I found out about the Sony Ericsson Update Service (SEUS). I
used it to fix the firmware inside my phone, even though the phone
seemed dead and my computer wouldn't recognize it. You can download the SEUS from Sony's website here:
http://www.sonyericsson.com/cws/support/softwaredownloads/detailed/updateservice/w810i?lc=en&cc=us
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