Touch screen touching itself automatically

Help!!
I just bought Lenovo A520 Core i3 4GB 1TB Windows 8 Blu-Ray All In One Desktop PC. The touch screen begins to touch itself automatically. I returned it to the retailer but they could not replicate the problem so they returned it to me. However, it didn't take long before the problem recur. Now I have to disable the touchscreen in order to use the PC. I am in the process of discussing with the retailer but if anyone here can help me get it sorted that would be great!
Thank you in advance for your help!!!
Best
S Li

I have a different machine, but last year I experienced touch screen issue. It turned out to be a external harddrive connect via the USB ports went defective. Try unplugging all external connectors and restarting the system to test if something like that is happening.
Good luck,

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Hello lowfellguy:
Welcome to HP's forum. No problem. All HP's computers come with a one year warranty . Yours is still covoered. Contact HP Direct Support using your HP Support Assistant through live chat results are faster. If it needs repairs they will write up a work order and send you a box and take it in for repairs free of charge . Use your warranty while you still have it. frrw

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edited 2x

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Touch screen touching itself automatica​lly

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Touch screen touching itself automatically