Lines on screen after os x update

I updated to 10.9.3 a few days ago and I now randomly see brief vertical lines on-screen. Just a moment ago it was a full grid. It stays for just long enough that I can see on the screen, the longest was about...2-3 seconds. It most often occurs when loading a new tab on a web browser, or during/after launch of an app. There are no error messages. Can anyone advise?

Hi shawnmo,
Welcome to the Apple Support Communities!
I understand that when you experiencing issues with lines on your display. I would suggest some specific steps such as resetting the PRAM and SMC. These steps can be found in the following article.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Reset the system
You can reset the Mac's parameter RAM and SMC.
Reset the resolution
Start by resetting the Mac's parameter RAM. If the display does not come up, was previously set to an unsupported resolution, and still results in no video:
Start up in Safe Mode.
From the Apple () menu, choose System Preferences.
Choose Displays from the View menu to open the preferences pane.
Select any resolution and refresh rate that your display supports.
Restart your computer.
I hope this helps,
-Joe

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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.
Click Kudos Thumbs Up on the right to say “Thanks” for helping!

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Lines on screen after os x update

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