I get glitch lines on external display

Ive noticed on my last monitor and this new one too. On certain web pages or video oriented tasks. Lines show up on the screen. They flash in and out. what could this be...bad video card?
I thought going to a DVI display would help but I guess not.

I've come to a conclusion that when the video card overheats the lines come.
Reason being, I opened the lid and the lines were still there and when I tested a dvd movie on full screen the lines were there. And watching a DVD movie on my display never used to cause lines. But I don't watch many movies on my powerbook.
Before plugging in my new external display I noticed that my powerbook was set on Better Perfomance and never hit sleep mode the whole time I was at work so when I came home the Powerbook was pretty hot.
As time went on with the lid open the lines began disappearing. So I decided to keep it open and not run anything too crazy and as the Powerbook cooled the lines started disappearing.
I ran a full screen movie like a half hour later and received no lines!
And here I am this morning using my lcd for the past hour and a half on internet and again, no lines.
Hope this helps.

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Message was edited by: Svendus

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Model Name: MacBook Pro
Model Identifier: MacBookPro9,2
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This question was solved.
View Solution.

HI Ezfilez,
I understand you are having an issue with the external display on your Windows 7 computer.
Sometimes it is in the BIOS. If you follow the link and update it should help resolve your issue.
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&dlc=en&docname=bph07110
Please let me know if you require further assistance.
Thanks
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom to say “Thanks” for helping!

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I get glitch lines on external display

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