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Every laptop has a facility to toggle the display from the screen to an external display. The exact method varies from brand to brand. But they're all a variation on the same theme. It's the Function button (Fn) and one of the F keys. On my HP its Fn + F4. I've had laptops in the past where it has been F5 and others that were F8. All of them though had a little symbol representing a screen on the correct key.
The way it works is that the laptop screen is on. The first press of the two buttons will put both screens on. The next press is just the output to the projector. The final press brings it round to the laptop only again.
Once you have just the projector running, then you should change the display resolution to suit the projector if the laptop hasn't already done it for you. You can tell when it's wrong because the text won't be crisp. Right click on the PC desktop and then select "graphics properties" or similar from the menu. Change the resolution from the drop down box. Click OK to confirm. The correct resolution for a projector is the native rate. This is the number of pixels on the display, not the maximum resolution.
To change your screen resolution1.Open Display in Control Panel.2.On the Settings tab, under Screen resolution, drag the slider, and then click Apply.3.When prompted to apply the settings, click OK. Your screen will turn black for a moment.4.Once your screen resolution changes, you have 15 seconds to confirm the change. Click Yes to confirm the change; click No or do nothing to revert to your previous setting.
The hot key for Dell to show your display in the projector is fn f8. Alternatively you can configure your display by right clicking on the desktop and choosing graphic option or graphic properties to configure the display to show both on your laptop and the projector. If you have done this and still it will not display in the projector, try lowering the resolution and/or frequency of your display. Use the lowest first and the make it higher to check up to what resolution it will work.
Connect a separate monitor to your laptop and verify that your laptop's external monitor port is functioning properly.
If yes, connect and power up the LP120. Press the source key on keypad. You should see the projector switch from video to computer.
Last option, does the projector display an "out of range" message on the screen. If so, reduce your laptop resolution to 1024 x x768.
The inFocus projectors typically force a lower screen resolution - you have to go back and reset the monitor to it's proper resolution. Only takes a few seconds - go onto a blank area of your desktop, right click, select properties, settings, then adjust the resolution.
Hope that helps - I've had the same thing happen when using a projector, and have never been able to have the screen automagically "readjust" after using the projector...
Connect the external display port on your laptop computer to the projection system, and then turn on the projector. For information about connecting external devices to your laptop, see the documentation for your laptop computer.
Set the display resolution of your laptop computer to match the resolution of the projector system. First, on your laptop, open the Display Properties dialog box by using the Display icon in Control Panel, and click the Settings tab. Then, in Screen resolution area, move the slider to adjust the display resolution of your laptop. If you don't know which setting to choose, try 800 x 600 pixels; this is a common setting for many projector systems.