AOC LM740 user manual Display shows OUT of Frequency error message

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The display shows OUT OF FREQUENCY error message:

♦Read chapter 6, Setting the Display Resolution, and select a graphics signal with the correct resolution and refresh rate.

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Contents By Envision Peripherals Inc LM740FCC Class B Radio Frequency Interference Statement For Your SafetyPrecautions Iii General Notes Other Notes Dealer Information DisclaimerMonitor Information Table of Contents Important Safety Instructions On Screen Display Auto Adjustment FunctionPower Saving High Quality ExpansionUnpacking the Monitor Installation and Removal of the BaseHardware Installation Windows XP Windows driver InstallationWindows 98, ME, Click OK to close Display Properties Setting the Display ResolutionPlease Note Supported Graphics Modes and Refresh Rate SelectionIncoming display mode Input timing Picture Optimisation Adjusting the MonitorOSD Menu Tracking Adjustment Position Adjustment Color Adjustment Other Image is blurred, how can I get the best quality picture? Frequently Asked QuestionsImage is displaced in one direction Display shows no Signal error messageNo image is displayed, what can I do? Image is or distorted, flashes or flickersDisplay shows OUT of Frequency error message On-Screen Display Functions Controls Mains power switch, AutomaticImage Position, Phase, Pixel ModelLine Frequency Video SignalSignal Connection Safety CSA, cULus, TUV/GS