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On some laptops, you need to enable the external monitor port. Look at the number keys across the top of the keyboard. There should be some legends in blue on them. These are associated with the Function (Fn) key. One of the blue legends will most likely activate/deactivate the external monitor port. Press the Fn key along with the associated number key to activate/deactivate the monitor port.
I highly doubt that your machine will allow more than one monitor without both of the monitors being the same image. External monitors on laptops can be used to extend the display, but only by using the laptop screen as one of the two. It is possible to split VGA to duplicate images on two screens, but true dual monitors will require a DMS output or something similar, which I've never seen on a laptop.
You do not say if your laptop screen is working or not or why you want to use an external monitor.
Assuming the laptop has no fault and boots properly, to send the laptop image to an external monitor, once you have booted into Windows, press and hold the Fn (function) key bottom left of your keyboard, near the Windows Logo key, then simultaneouly press the Function key (above the numbers) with the image of 2 monitors, 1 dark, 1 bright (often the F4, F5 or F6 key).
If the laptop's screen is faulty and the above procedure does not work, there may be damage to the graphics card which will probably require specialist repair.
Desktop PCs automatically seek an external monitor to output graphics to. Laptops default settings send the image to the internal monitor. You need to manually instruct the laptop to export the image to an external monitor.
With the cable connected and the monitor powered up, try pressing the Fn key (bottom left of keyboard) on the laptop and simultaneously pressing the function key at the top ofthe keyboard with an image of 2 monitors (often F5 or F6) to sent d the image to the external screen.
I would go ahead and boot into safe mode where you say it does work and then take a look. See how it detected it...ie look in device manager and see if it picked it up by it's true brand/type etc. Check the settings both of the display and on the envision itself. Check the resolution selection. It's probably picking it up as a lower res. but when it boots into reg windows may be trying to run at full res and perhaps that's what it won't do. Check to see what driver it's using. It may need the specific driver from envision and not the generic driver. It could also be a bad pin on the envision itself.
If you have another computer you can hook it up to, do that to make sure the envision is working. That way you can deduce which is the problem, the monitor or the setup in your laptop.
There is often a function monitor key on the laptop, located near the F7 key area, the icon looks like a monitor on|off and is typically in blue. this key is to be used in combination with the Fn key to enable, disable the external monitor or enable both monitors or just the laptop.
Press the key combination until your laptop panel lights up while the monitor is plugged in. Now check your extenal monitor refresh rate and resolution slider settings by right clicking on your desktop go to properties / video settings. (please note monitor settings are under advanced). You should see two monitors in there now. use "identify" button so you know which one to work with. on the external monitor settings, decrease (slide left the slider all the way). If you can set the monitor refresh to 60Htz.
Lastly take a flashlight and check if you can see a shadow of your screen on the external monitor, if you can that means the backlight is not working and likely needs the inverter replaced.
Hope that helps !
Make sure the external VGA port on your laptop is enabled. Not all laptops automatically detect a monitor connected and turn on the port. There will be a function key somewhere on the keyboard to control the port. Location varies by manufacturer and model. The usual sequence when you press the key is: laptop display on and external VGA off, laptop off and VGA on, both on.
If I understand You are using a Monitor connecting the Monitor...
and the background is shared byboth the display however the Cursor stays only on one of them at a time.However it can be toggled among the 2.
then this Feature is called the Extended Display.
Use the same Key Combination that you would use for external Display one More time and it should Work.