my ipad won't charge / turn on despite pressing on/off button or home button.

My ipad won't turn on / charge. I'm not sure which problem it is. Despite charging a one month old ipad all night I cannot turn the ipad on. I have trie connecting the charger to a different socket and also via my laptiop but no joy. There is 'ding' noise when I connect the charger and no messages or battery icons on the ipad. Please can someone help as I desparately need my ipad for studying.