Digitizer Power Button Troubleshooting

Hello, I recently replaced my I phone 3G battery and now cant unlock the phone because the screen will not swipe to the right. I first thought it was a digitiser issue but then I double tapped my home button to find that I could successfully play music by pressing the button associated with the small music player controls from the lock screen (all music related buttons respond as normal). I attempted to hold the home button and power button, but it seems that only the sleep mode will work from pressing the button twice. If is try to hold the power and home buttons to perform a hard re-boot nothing happens..

Any thoughts experienced troubleshooters?