Checkered pattern on screen

[fr0d0]

Whenver I minimize an application I get a checkered pattern until it's minimized on the dock. I also get this checkered pattern when I go into full screen in powerpoint.

Any idea what could be causing this?

I already ran disk utility and repaired.

 

[l.a.rossmann]

Is your machine an A1150, A1211, A1212, or A1151 model? Check the bottom.

 

[fr0d0]

It's A1278

 

[fr0d0]

bump