A 3cm wide, bright white vertical line has appeared o my screen. I can't get it off.

A 3cm wide, bright white vertcal line has appeared on my screen and I can't get it off.

Hello:
I suggest you take it in for diagnosis/service.  The problem would appear to be hardware.
Barry

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    Please call our technical support at 800 474 6836. If you live outside the US/Canada Region, please click the link below to get a support number for your region.
    World Wide Phone Support
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    I work on behalf of HP
    Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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