Your monitor does not support the display settings you have set in your operating system.
To change these settings go: (Windows 7)
Control Panel > Display > Screen resolution [Change to 1440x900]
then on the same screen, go to Advanced Settings > Monitor > Screen Refresh Rate [Set to 60 Hertz].
(This usually happened if you switched monitors, or used a TV, or maybe a projector).
You can use the same method to set up any resolution or refresh rate you want.
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