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My computer is not recognizing my 3rd monitor even though my external video card is working

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What kind of graphics card you have. Is that can be able to use 4 monitors.

Posted on Jul 27, 2009

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When I turn on my computer monitor it goes to sleep within a few seconds. What can I do?


For desktop computers: check that the computer is on. Make sure that the monitor is connected to the correct port on your computer. Some desktops have graphics ports on the motherboard and a separate video card. In that case, the motherboard port(s) will be disabled.

Try a different cable and make sure that both ends are secured properly. (If there are multiple input options on the computer and the monitor, try a different port. Sometimes, a port fails. There are adapters available for DVI to VGA or DVI to HDMI if you don't have extra inputs on the monitor.)

Try a new video card and check that your Power Supply is rated to power the entire system. (Some video cards will not work at all if the power supply does not provide enough power to the card. Some power supplies have multiple rails and can't give enough power even though the overall power is sufficient.) Unfortunately, if you have been using a video card, connecting the

If you are connecting the monitor to a laptop, make sure that the external video port is enabled. Some machines will have the port disabled to save power.

If this was the first time using the monitor, make sure that the computer was off when you connected the cable. Then turn on the monitor and select the appropriate input (if needed) before turning on the computer.

I hope this helps.

Cindy Wells

Jul 12, 2014 | Computers & Internet

1 Answer

How do I enter setup?


Setup is usually entered by pressing the delete button or F2 (or F1 .. it depends on your computer..) during the boot-up process.

However, as you say there's absolutely nothing on your monitor which you know works, suggests that the fault lies elsewhere. If there's nothing at all on your monitor it may be a failed video card/chip.

I take it that your computer actually powers up even though you can see nothing on the monitor?

If you can, try another video card in your computer. If the monitor then works, you know it is the old video card/chip at fault.

If, after trying a replacement video card and there's still nothing on the monitor, you'll have to suspect a motherboard fault.


Jan 03, 2014 | HP PAVILION M8200N PC Desktop

1 Answer

Display are not showing cleanless


Try connecting an external monitor to the computer and see if it displays better. Borrow a monitor from a neighbor, friend, relative or co-worker and connect it to the computer. If the Borrowed monitor displays ok, then your video card inside the computer is good, but your lcd screen is bad. If the Borrowed monitor displays the same way with problems, then your video card inside the computer is bad.

Shine a flashlight on the dark screen to see if you barely see the icons on the desktop. If so, then the LCD Inverter is bad.

Plug in an external monitor and see if the display shows up on it. It can be any kind of monitor even the old big fat crt monitors as long as it has a vga cable to connect to your computer's vga port. If the video shows on the external monitor that proves your video card is ok, ,but your lcd screen is bad. The video will show on most systems when you reboot without you having to do anything. Some systems will require you to hit the FN (Function key) + F1 thru F12. Hold down the FN key then hit the correct key for displaying on the monitor (F1 thru F12). The correct key will normally have CRT/LCD on it or it will have the icon of a display.

If you see no icons by shinning a flash light and the external monitor works, then your screen is bad. If you see no icons by shinning the flash light and nothing shows on the external monitor, then most likely your video card is bad.

Jun 09, 2012 | Lenovo G555 Laptop

1 Answer

My screen keeps running down and the computer emmits a howling noise when i switch it on.why


Maybe your lcd screen is going bad or the video card is going bad. Try connecting an external monitor to the laptop and see if it works.

It can be any kind of monitor even the old big fat crt monitors as long as it has a vga cable to connect to your computer's vga port. If the external monitor works ok without the running down then your video card is good and the lcd screen is going bad. If the external monitor does the same as your lcd screen then your video card is going bad.

The video will show on most systems when you reboot without you having to do anything. Some systems will require you to hit the FN (Function key) + F1 thru F12. Hold down the FN key then hit the correct key for displaying on the monitor (F1 thru F12). The correct key will normally have CRT/LCD on it or it will have the icon of a display.

May 20, 2012 | Computers & Internet

1 Answer

Screen Jumping


Maybe your lcd screen is going bad or the video card is going bad. Try connecting an external monitor to the laptop and see if it works.

It can be any kind of monitor even the old big fat crt monitors as long as it has a vga cable to connect to your computer's vga port. If the external monitor works ok without the jumping then your video card is good and the lcd screen is going bad. If the external monitor does the same as your lcd screen then your video card is going bad.

The video will show on most systems when you reboot without you having to do anything. Some systems will require you to hit the FN (Function key) + F1 thru F12. Hold down the FN key then hit the correct key for displaying on the monitor (F1 thru F12). The correct key will normally have CRT/LCD on it or it will have the icon of a display.

May 20, 2012 | Computers & Internet

2 Answers

Monitor changed to yellow colour.... what is the problem...?


Monitors mix the 3 "primary" colours, in various proportions, to produce all other colours.

Mix equal parts of all 3 colours, and you get WHITE.
Mix equal parts of only 2 colours, and you get YELLOW.

So, either:
1. your computer's video-card is not sending the 3rd colour;
2. your video-cable between the computer and the monitor is broken, and is not transmitting the 3rd colour;
3. your video-cable is not TIGHTLY connected at each end;
4. the electronics inside the monitor that SHOULD be producing the 3rd colour have failed.

Try connecting the monitor to a different computer, with the same video-cable. If it works correctly, your video-card is the problem.

Try connecting the monitor with a different video-cable, to see if replacing the cable fixes the problem.

Try connecting the monitor to a different computer, with a different video-cable. If it still is incorrect, then the monitor needs repair/replacement.

Jan 14, 2010 | Computers & Internet

2 Answers

Laptop screen blank at start up


If it still doesn't work when you hook it up to an external monitor, assuming you did that properly, then it is your motherboard/video card.

If you have a seperate video card, I would replace that first. If you don't have a seperate video card, then you need a new motherboard.

FIRST - I would try hooking it back up to an external monitor, and making sure you switch it over to use the external as the default. otherwise you wont get picture.

Sorry... good luck.

Sep 10, 2009 | HP Pavilion dv2120us Notebook

1 Answer

Computer not recognizing video card maybe?


If you have a onboard graphics on your mobo they may have been turned on somehow I would check there and disable them if they have been.

Aug 15, 2009 | ASUS Extreme AX800XL Radeon X800XL, (256...

1 Answer

Monitor says: no signal input check video cable Even though the computer is on and hooked up


if it says so....it indicates that the display card is gone bad. check with the display card...
or try inserting New Graphic card or PCI VGA card... works for sure....

Jun 23, 2009 | Hannspree HANNS-G 19" Widescreen Monitor

2 Answers

I want to run 3 monitors on my dell vostro


Hi,
 
Couple of points I’d like to mention. Vostro has two models slim and mini tower. Both of them are mostly similar so this should be applicable for whichever you have.
 
The default graphics card on the computer is integrated on the motherboard. When you add another video card, say to the PCI-Express 16x slot on the motherboard, this disables the integrated video card.
 
If the 2 monitors are connected to the video card, both would get display.
When the computer is turned ON, if you plug in the 3rd monitor to the integrated video card, you would not get any display on the 3rd monitor. BUT if you restart the computer with the 3rd monitor plugged in, the computer would give a signal to the 3rd monitor and disable the two monitors connected to the video card. This feature is added on purpose to diagnose any possible video card problems. Eg. Assuming there was a problem with the video card, if this feature were not available you would not get any display on the monitor from any of the ports and you would not be able to diagnose if the problem was with the monitor, integrated video or the video card.
 
Hope this helps. Please rate your feedback!
Thanks,
VJ

Mar 04, 2009 | Dell Vostro 200 Desktop Computer

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