I have a straight horizontal line across my screen

Hi Folks
have a straight horizontal line across my screen. Can assist?

Yes, move the screen slowly back and forth, if it changes, you have a damaged monitor feed cable
Does it appear in all screens?
Does it vanish from time to time?
post a pic, hook your AIr up to an external monitor, if its there, its GPU /logic problem
if its gone, its as mentioned a bad monitor feed from the logic via the cable.
perform SMC reset and re-verify
SMC reset
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.
Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.
Contact Apple for an appt. for in shop diagnostics and likely repair.

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Hi @Sillenn
Welcome to the HP Forums!
I would like to take a moment and thank you for using the forum, it is a great place to find answers. For you to have the best experience in the HP forum, I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I understand that you had red transparent horizontal lines across the entire screen. You rebooted your system and they were gone , but you are concerned they may return.
Here is a link to Display Quality Issues to assist you .
You can run The HP Support Assistant to aid with HP updates to ensure you have the latest drivers
You can test the video card for failure. Testing for Hardware Failures (Windows 7, Vista)
Please let me know the outcome.
Sparkles1
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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Horizontal lines across the screen of my Vision:M, need he

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Welcome to Apple Support Communities
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Start up in Safe mode.
http://support.apple.com/kb/PH4373
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Kosh
Press the 'Accept As Solution' icon if I have solved your problem, click on the Star Icon below if my advice has helped you!

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Hello again javajohn23,
I would like you to try the following steps:
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Please re-post with the results of these steps. 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!
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http://www.daniweb.com/techtalkforums/post24947-5.html
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I have a straight horizontal line across my screen

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