Graphics Card Issue?

My friend's mac is having these (below) issues, I'm trying to figure out the issue for him, but I'm not a mac person.

I'm going with the result that it's his graphics card (or possibly his monitor).

But some reassurance or counter-results would be great.

He's unable to give me exact specifics of his mac (it's really old), but he said it's running the latest software (OS X Lion? I think it is the latest).

Here are 2 screen shots of what he's experiencing.

http://i.imgur.com/NnJ9hjq.jpg
http://i.imgur.com/zzrbbop.jpg