Random Lines Appearing on my Mac

[Osak]

Has to do with your graphics card overheating.

[Ad Bot]

[JakDaStripR]

I think Steve Jobs doesn't like you.

[Radial543]

I have these on my Mac too. From what I gather, they are due to your Mac having a faulty system fan, causing overheating. I would advise that you dust the inside of your Mac and hope for the best!

[SeventhSandwich]

Broken Graphics driver.

[Miga]

It's just the Apple Computer innovation kicking in.