Hmmm... touchscreens can be complicated in ruling out what is excatly causing the root of the malfunction. First check to see if you turned the touchscreen option off. There could be a FN button that disable the touch screen and maybe you accidently disable it. I used to have a tx1000 too, but sold it because of the common heating promblem of these machines that cause future malfuctions, only if I sitll have it, I'd be more clear about it. However if that doesn't work, then it could be a driver promblem. Did you change the operation system?, deleted programs associate to the touchscreen? or updated a newer version of the drivers? If this is it, then common promblem could be associated with the drivers of the touchscreen, you will have to reload the driver agian, and can be found in the Hp drivers support section. Other then that, if promblem has not been fixed, then a cablewiring in the laptop somewhere that connected with your screen has become discconnected and loose, because surely those hp tx does do so twisting and turnings which your going to have to take the laptop apart.
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