Support Touch Screen suddenly not working...

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http://androidforums.com – Hi all, The touch screen on my HTC Sensation has suddenly stopped working. The locking ring works, so I can answer the phone if someone calls. I can view a new text message by pulling the notification bar down, and touching the message. But I can't scroll through messages and the icons are untouchable. Any ideas? I feel like I've lost my right arm! Thanks in advance. (General)