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I'm sorry about the issue. What's the error or message when connecting the kindle to the current Wi-Fi? Can you press & hold the power on/off button on the kindle for about 45 seconds, then turn it back on and check?
If that does not work, it looks like you have forgotten your kindle device password, so you have to reset it to factory settings, but don't worry, you won't lose your books. Your purchased books always stay in your Amazon account http://www.amazon.co.uk/manageyourkindle, and you can always re-download/sync your books back to your kindle ereader, and/or read your books on another device, such as on a computer, or tablet, or smartphone, etc.:http://www.amazon.co.uk/gp/feature.html?docId=1000425503
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