The white screen could be a an issue with the display...
Does it take pictures?If the screen stays white, and it sounds like it is snapping off shots and you can get pictures off the card, it could be a display problem.
Then you need to decide how comfortable you feel about opening it up, or if you want to send it off. I opened up a broken W90, and it was not so bad, and I was able to keep the weather sealing in tact so I could submerge it. The issues I ran into were with the charge of the flash, which can shock you. If it is your display you would need to get a new one...
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