Intermittent horizontal line(s) appearing on screen

Greetings,
3 month old MBP
I'm getting horizontal line(s) showing up on the screen running the width of the open window. I've seen them mostly in Mail but also in Safari and Finder. The line is a pixel width thick. Sometimes it stops before reaching the edge of the window.
Any help / ideas would be greatly appreciated. I'm suspecting a hardware problem but it is a difficult one to diagnose / prove given it is hard to reproduce in a consistent manner.
Thanks,
Rod

I reinstalled Leopard from scratch to help eliminate software as the issue. After re-installation, there were still problems especially with graphics intensive apps. Returned the unit to my local Apple repair. They replaced the logic board under warranty and I have not seen the horizontal lines on the screen since then.

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