There is a bit issue with HP Touch Smart 520 all in one desktop pc. It goes in the sleep mode when not used for around 15 minutes. Before I usually tap on the screen to turn it on. But now when I try to do the same it is not working. I had tried doing this many time but the system is not responding when I tap. I am unable to get display. What can be the issue. The system wake when I hit any key from the keyboard.
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