Most laptops can switch between the internal display, the external display, and both by pressing the "Fn" key and one of the function keys (such as F5).
While you can hook up an external monitor to your computer if your video card is not working, it will not display anything.
This would generally be observed on a laptop/notebook system when you are using the integrated screen and do not have an external monitor attached. If you try to switch from one display to the other, it will tell you it has no external display to switch to.
You need to go into the preferences and set up the display settings, ATM it's doing a dual display thing, you want it to either mirror the display or just only use the external display :)
An external monitor - will prove that the device is actually working (and it's just the display that's at fault).
Exterorecptors - monitor changes in the external environment Interoreceptors - monitor internal body conditions
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Laptops generally have LCD displays. They also usually have a connector on the rear of the laptop where you can attach an external monitor. Using an external monitor is a good way to diagnose a defective laptop display if you suspect t the LCD laptop display is bad.
You may have the picture routed to an external monitor, most laptops have a key which combined with the "Fn" key will switch the display back and forth between the LCD and the external port. If there isn't even any light coming from the display then you may need to reseat the LCD cable where it connects to the motherboard, or you may have a faulty backlight. If this is the case then you should still be able to get a picture from an external monitor and run the diagnostic tools that come with your laptop. If your laptop is on and you get no display from either the LCD or the external monitor even after switching the display output back and forth then your laptop is not completing POST, and you need to check the error codes in the user manual.
what is the display resolution for a CGA monitor?
monitor is an output (display) device
Plug the monitor into the laptop. Easy as plugging in a lamp. Let's hope the port isn't damaged, too. However, some laptops will not begin using an external display unless you set it to from the advanced display properties (in Windows), in which case the laptop's monitor needs to be at least somewhat usable in order to use the second one. Answer I would suggest to replace the whole LCD screen. I bought the LCD from ScreenCountry and completed the rebuild, booted the machine up, and everything worked absolutely perfectly. That's a better solution than connecting a bulky external monitory into a portable device.
Right click on the desktop, go to screen resolution, and select the second monitor. At the bottom, there should be a check box that says "Make this my primary monitor." Click it, and hit apply. I do this all the time.