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At checkout after I enter my payment details and click the button nothing happens!

If, you are using Magento version 1.4.x then, this could be because your current theme is not compatible with the version of Magento you are using.
Follow the steps in this link to check if, your theme is compatible:
http://sree.cc/magento_ecommerce_tips/checkout-not-working-on-magento-version-1-4-x