Use Mode가상리모컨¤ > Menum > Support > Use Mode Try NowSelect the TV's usage mode. If your TV has been unintentionally set to Store Demo, you can changethe mode with this option. Store Demo should be used in retail environments only.Support Info가상리모컨¤ > Menum > Support > Contact Samsung Try NowCheck the information below if your TV is not working properly or you need information on upgradingthe software. The section below contains useful information about the product and instruction onobtaining the latest software.Display ResolutionConnect a computer to the TV and then configure the computer's resolution by referencing the tablebelow. The optimal resolution is 1920 x 1080 @ 60Hz. Choosing an output signal not included in thetable can result in a blank screen or just the power indicator being turned on. Refer to the user manualof the graphics card and configure the resolution as indicated below.IBMResolution(Dots x Lines)StandardFrequencyHorizontalFrequency(KHz)VerticalFrequency(Hz)Clock Frequency(MHz)Polarity(Horizontal /Vertical)720 x 400 70Hz 31.469 70.087 28.322 -/+MACResolution(Dots x Lines)StandardFrequencyHorizontalFrequency(KHz)VerticalFrequency(Hz)Clock Frequency(MHz)Polarity(Horizontal /Vertical)640 x 480 67Hz 35.000 66.667 30.240 -/-832 x 624 75Hz 49.726 74.551 57.284 -/-1152 x 870 75Hz 68.681 75.062 100.000 -/-