System hangs unless mouse moves

I have a strange problem where my system hangs unless I move the mouse. I can open a terminal window and type but nothing appears on the screen until I move to mouse then I see the text I typed. Also if I click a button nothing happens until I move the mouse. Very strange, any ideas about what to check?

FreeBSD 8.0
 
Yes that did it. Thanks. It was so annoying to have to keep moving the mouse while working. lol
 
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