Touchscreen just stopped working Satelite u840t

Can anyone advise, I am now running windows 8.1 but my touchscreen isnt working?

mine also stopped working recently, no reason for it.
any windows update you are concern about?
i attached the details for the model I own.
Attachments:
Satellite U840t-103 - Toshiba.pdf ‏192 KB

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Hello FredBus,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I understand your TouchScreen stopped working and you are inquiring as to whether you can toggle it off and on.I would be happy to assist you, but first I would encourage you to post which operating system you are using. And whether your operating system is 32-bit or 64-bit as with this we can provide you with accurate information.
Which Windows operating system am I running?
Is the Windows Version on My Computer 32-bit or 64-bit?
Please re-post with the requested information and I would be happy to provide you with assistance. Thank you for posting on the HP Forums. Have a great day!
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
Dunidar
I work on behalf of HP
Find out a bit more about me by checking out my profile!
"Customers don’t expect you to be perfect. They do expect you to fix things when they go wrong." ~ Donald Porter

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I have an article for you that can help you continue to troubleshoot this issue with the Wi-Fi on your iPhone. The article can be found right here:
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http://support.apple.com/kb/ts1398
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Message was edited by: weatherfreak
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Could you please elaborate a bit more about the issue ,what exactly has happened?
Are you not able to launch and PDF' or getting some error message ?
You can log in to Adobe.com with your credentials .If you do not have any prior credentials ,you need to create an account .Adobe.com will either let you purchase the product or opt for a trial version.
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Touchscreen just stopped working Satelite u840t

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