Why does my MacBookPro 10.5 suddenly display B&W diagonal lines?

My MacBookPro 10.5 displays black and white or yellow and white diagonal blocks when
scrolling on Safari browser window. This completely obstructs the page. I have no available
software updates and have changed no settings. I did sync the MacBook to my iphone 3GS two days ago which has never caused issues in the past. Could this possibly be a virus??

Welcome to Apple Discussions!
Does your Mac have the NVIDIA GeForce 8600M GT graphics chip? If so, you might have this problem:
http://support.apple.com/kb/TS2377
If you have access to an Apple Store, there is a specific test they can run to diagnose this problem. If it turns out to be the NVIDIA problem, the repair will be done at no cost to you.
Good luck!

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