Question Htc Legend Touch Problem

Since Long Time I Am Using Htc Legend. Recently I fracing Touch Problem In my Htc Legend.
I have hard reset th phone but no luck, it seemed that everything was OK but no luck. I couldn't unlock the screen or notification bar dropped every time I touched the screen. Then I tested my touchscreen with Simple Touchscreen Tester application, and found out that top 7mm of my screen doesn't or berely react on finger touches.