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Dual monitor not working

I have two computers which have two screens one 20” one a 32”

I can’t have to computer display on both screens at the same time, the computer will only displays on one at a time
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Abraham Deutsch
Asked:
Abraham Deutsch
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1 Solution
 
CompProbSolvCommented:
When you say "one at a time", how are you switching between them?

Try the following:
Right-click on the desktop
Left-click on Screen Resolutiom

How many monitors do you see in the upper box (to the left of Detect and Identify)?
If there are two, then click on each and select "extend display" in the lower drop-down box (once for each display).
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rindiCommented:
How are the displays connected to the PC? Does your video adapter support multiple displays? Have you installed the proper video adapter drivers for your OS?
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Abraham DeutschIT professionalAuthor Commented:
When both are plugged in at the time of starting the computer it will show two, but only the 20” will work and when pressing Identify nothing will show on the 32” (the 32” will be grayed out). If I start the computer with the 32” plugged in the computer will stared on the 32” and then (after starting up the computer) it will only show one screen.

I updated the drivers and even tried a new video card.

On the other PC I have two 20” monitor working fine, but cannot add the 32” via a converter to USB, and even when removing the second 20” monitor and plugging in the 32” directly to a display port (not convert to USB) it does not work (It worked for a few hours then it stopped)
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rindiCommented:
The it looks like a problem with the 32" display. Does it work when only the 32" display is connected? Does the device manager properly show the manufacturer and model number of the display?
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Abraham DeutschIT professionalAuthor Commented:
Yes when only the 32” is connected it works.
Since I have the issue on two computers, two displays, (in different rooms in the school) it would indicate the issue is not the display
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CompProbSolvCommented:
Are both monitors connected to the same card or to the same motherboard (as opposed to one to a card and one to a motherboard)?

When you are in Screen Resolution and you click on the greyed-out monitor, what do you see in the dropdowns?
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rindiCommented:
Does the device manager properly identify it?
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Abraham DeutschIT professionalAuthor Commented:
Not with its "name" but seeing it as a monitor same as with the 20" .
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rindiCommented:
Normally it should show you the correct monitor model number, unless there is a KVM in between. If it doesn't, then usually it is a driver issue.
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Abraham DeutschIT professionalAuthor Commented:
Driver from the monitor?
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CompProbSolvCommented:
I have also seen a bad VGA cable cause the monitor to be indentified as generic, but that shouldn't cause the problem described here.
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rindiCommented:
No, the Video card. The display should be able to advertise it's specs to the video card using EDID. But for that to work the video card driver must work properly, and you must have a direct connection to the display, as things like KVM's etc often mask the EDID data.
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CompProbSolvCommented:
@rindi:
If it is not identified correctly, do you think that would prevent both monitors being used at once?  Certainly mis-identification is an issue that should be resolved (especially when trying to set proper resolution) but I'm skeptical that it could cause this specific symptom.
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rindiCommented:
If the card tries to use a resolution the display doesn't support then the display would show nothing.
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Abraham DeutschIT professionalAuthor Commented:
Do I understand you correctly, the issue is the card is not enough powerful to support these load. And should be replaced with a more powerful card.
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CompProbSolvCommented:
"a resolution that the display doesn't support".... good point.  That should be able to be tested by setting some basic resolution such as 800x600 on both monitors.  A problem here is that we've not been told what is shown in Screen Resolution when the non-displaying monitor is selected.  That could tell us a lot.
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rindiCommented:
It may be a problem of the card, but we would need to know more details on your hardware to be able to say.
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Abraham DeutschIT professionalAuthor Commented:
One was connected to the motherboard and one to the video card. Plugged in both into the motherboard and both are working. Thank you all for your help
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CompProbSolvCommented:
In many cases, if you use an add-on card the onboard video is disabled or otherwise non-functional.  If you want two monitors to function you would typically connect both to the motherboard (if it has a second video connector) or both to a video card.
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