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At the bottom of the screen where the spacebar and number zero is has just stopped this means i can not double click and remove history i can not click anything which is there for example iMessage Music Mail what shall i do ?

Here is step by step instructions to guide you through a screen replacement, iPod Touch 4th Generation Front Panel Replacement, and here is a new screen, good luck, http://www.ifixit.com/iPod-Parts/iPod-To