There is box or rectangle moving on the screen. How can I get rid of this?
If a restart doesn't fix it, do a Safe Boot, Shift at the startup chime. Will take much longer to boot. If upon doing an ordinary boot after a Safe Boot, it returns, it may be the graphics card is going south.
If the box is black and accompanied by speech, press the key combination command-F5 to deactivate VoiceOver. If that doesn't work, proceed as follows.
For OS X 10.7: From the menu bar, select
▹ System Preferences ▹ Universal Access ▹ Seeing ▹ VoiceOver: Off
For OS X 10.8: Select
▹ System Preferences ▹ Accessibility ▹ VoiceOver
and uncheck the box labeled Enable VoiceOver.
Good catch Carnac.
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