I have a similar situation when I had some water spillage on my PRS 500. It refused to turn on every morning even the night before the batter meter shows a close to full charge. It still would not turn on even if charging it for a long time.
I later found out that plugging it into the AC adapter, press the preset button on the back and hold few seconds, then push the power switch simultaneously would start it up.
Give that a shot...see if that helps.
|