A friend of a friend is selling an iPhone 32GB 3GS for $75. It turns on, but the screen is white. He says he doesn't know how to fix it and wants a new phone anyway. He says it's never been exposed to water. I'm not sure what water damage in an iPhone looks like. I saw online how a reset can probably revive a white screen on an iPhone. Is it worth taking a chance for $75? Is water damage a possibility?