Phone won't turn on

@whammo96 good step with the battery but you did not tell us if you did anything else. The very first thing you want to do is to not try to restart the phone. This may further damage your phone. You also do not want to try to charge it any further. The next thing to do is to clean it. Disassemble your phone using these guides. Once it is disassembled, you do need to clean it properly. You will need high grade isopropyl alcohol and a soft brush. Use this guide to see how to clean it. Even so it was written for an Apple iPhone 3G all the points are still pertinent to your phone. You must remove all the EMI shields for a proper cleaning. While you are cleaning it, check for any broken, missing or burned looking components. When it is properly cleaned, replace the battery. All these steps are to avoid delayed failure caused by corrosion. Once all this is done, reassemble your phone and reevaluate. Your black/blank screen could be a bad LCD or a shorted logic board. Perform the steps mentioned, then re-evaluate. You may have to get a new display for it after your evaluation. Keep in mind that water damage is the hardest to diagnose and the toughest to repair since virtually any part may have failed.