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?