Try the hard reset, but that probably wont work. You probably need a new screen. You may have a short in the cable for your screen, or some of the backlight bulbs could have burned out. Also, If it's damaged from water, a new screen likely wont help.
I don't know which Kindle you have for sure, so double check for compatibility, but here's a replacement screen on eBay for about $50: http://www.ebay.com/itm/Replacement-LCD-...
You can find a repair guide video by clicking on the Kindle picture. I'm sure they have more screen replacement guides on the internet as well.
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