Screen Flickering

Recently my screen has been begun to flicker with white and black lines going across it. Mainly when I'm editing things in Photoshop, but it's become more often as of recent. I've updated to Lion a while ago, I have noticed many bugs with Lion, I guess this might be another.

I usually am in photoshop anyhow, it's my work computer, but when I take my macbook pro home, it doesn't have that problem on my monitor at home which isn't a Cinema Display.

Why would this be happening?