Blue split screens

[Denise B]

I'll be working on something (anything, word, iTunes, iPhoto, the internet) and the screen goes blue, small, and goes into the corners of the monitor. Multiple screens are in different corners. If I don't have multiple screens open, then it splits to the screensaver. I spend half my time on the computer chasing the screen. Any ideas as to why this happens and how I can stop it. Sometimes, it just goes blue but doesn't split.