Windows 8.1 Samsung Chronos series 7 touch screen has become unresponsive

hi - the other day after several months of absolutely normal operation, my Samsung Chronos NP780 Z5E T01UK touch screen became unresponsive - it simply didn't react any more to touch. I trawled the internet for what could be at fault with little success. Then I tried a couple of things, in Device Manager to do with putting hardware to sleep to power save, and then I managed to find a way to recalibrate the screen and low and behold it then worked... for a bit... since then however I later had a couple of BSOD equivalents where the machine simply turned itself off and rebooted... and since then nothing I try will get the touch screen back - I've downloaded every Windows 8.1 update, I've downloaded all the available Samsung software, including the graphic driver at 800mb and the Touchpad driver, done everything and still no joy. In fact, I now think that the laptop doesn't even realise it has a touch screen because when I manage to get the Search box up in the right hand of the screen and type 'Calibrate' which I think is what I successfully got to last time, the relevant entry 'Calibrate the screen for pen or touch input' no longer appears.  Grateful for any ideas, thanks

UPDATE: I was rooting around in Device Manager wondering why I couldn't even see the touch screen listed as a Human Interface Device. Anyhow, I found the ability to reveal hidden devices in the menu at which point I saw, in feint font, 'HID compliant Touch Screen' in the list. I went into that and saw  'Currently, this hardware device is not connected to the computer. (Code 45)' To me this is reflective of / an explanation of the above behaviour, the machine doesn't even see the device yet I haven't dropped the machine or anything to cause a connector on the inside to come loose...
Adrian_HarrisAsked:
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JohnBusiness Consultant (Owner)Commented:
Is your machine under warranty?  I would say (based on your description above including driver updates) that your screen is faulty. It could be the connector or the screen itself.

Does the computer have a VGA output and if so can you try a different screen.

.... Thinkpads_User
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Adrian_HarrisAuthor Commented:
I think it probably still is, but I would have a work continuity problem so would want to be certain that there is no other solution. I do have a VGA output which still works fine and indeed my main monitor also works fine apart from the total lack of touch screen functionality...
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JohnBusiness Consultant (Owner)Commented:
You have tried drivers so short of a fresh install of Windows (consider getting a test hard drive), I am not sure how you can prove the issue.

... Thinkpads_User
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McKnifeCommented:
Totally agree. Best would be a second installation, this could even be done to the same hard drive, into a VHD file like shown here: http://blogs.technet.com/b/haroldwong/archive/2012/08/18/how-to-create-windows-8-vhd-for-boot-to-vhd-using-simple-easy-to-follow-steps.aspx
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Adrian_HarrisAuthor Commented:
closing out
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Adrian_HarrisAuthor Commented:
I found this solution on the Windows Community website and it worked.
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