Screen has a vertical line that flickers sometimes... please help

My screen suddenly had a vertical line that flickers (sometimes), it's green. I don't know how it got there and where did it come from. It just suddenly appear. I left my computer running (and at that time the line wasn't there) as I was waiting for an email to come through but when I got back to it, it had the line. I've restarted my computer but it was still there. What could be the problem and how to fix it? Please help. Thanks.

Open up your OS Help Menu. In the search field type display.
Search among the troubleshooting topics & click on the one(s) that pertain to your issue.
If you have AppleCare you may wish to take advantage of same and/or Chat with a Support Agent. The online chat support is available 24 hours a day, 7 days a week.

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please help me with dis...
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Screen has a vertical line that flickers sometimes... please help

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