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Windows 7: Windows 7 doesn't recognize second monitor.

22 Dec 2012   #11
petko131

Windows 7 x86 Ultimate
 
 

What GPU (Graphics card) do you have?
If you don't know, check in device manager under "Display adapters"


My System SpecsSystem Spec
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22 Dec 2012   #12
Kevin86

Windows 7 64bit
 
 

AMD Radeon HD 6530D
My System SpecsSystem Spec
22 Dec 2012   #13
alphanumeric
Microsoft MVP

Windows 10 Education 64 bit
 
 

You mentioned a "VGA splitter" in your first post, could you provide more info on what that is exactly? If it's what I think it is it just sends the same VGA signal to two monitors at once. One monitor will mirror the other. If so, to use dual displays each monitor must be on a separate video connector on your video card. Each monitor needs its own source.
My System SpecsSystem Spec
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22 Dec 2012   #14
petko131

Windows 7 x86 Ultimate
 
 

Quote   Quote: Originally Posted by Kevin86 View Post
AMD Radeon HD 6530D
That's an integrated card, so could you possibly connect both monitors to the card (from the net specifications i see that it has 1 VGA and 2 DVI, so it is possible) if you have the needed cables, and if the monitors support this kind of connection...
I'm suggesting all of this in order to avoid using the VGA splitter you mentioned earlier.
I assume that your VGA splitter looks like this:


Attached Images
 
My System SpecsSystem Spec
22 Dec 2012   #15
Kevin86

Windows 7 64bit
 
 

It's weird, online it says my graphi card suppose to has two dvi slots, but there are no dvi slots at all, just one VGA and one HDMI...

This is the splitter I'm using
My System SpecsSystem Spec
22 Dec 2012   #16
petko131

Windows 7 x86 Ultimate
 
 

Quote   Quote: Originally Posted by Kevin86 View Post
It's weird, online it says my graphi card suppose to has two dvi slots, but there are no dvi slots at all, just one VGA and one HDMI...

This is the splitter I'm using
To be honest, the splitter doesn't make the difference, but it's weird that your GPU doesn't have the mentioned connectors (2 DVIs missing)...
You say that you have only changed the operating system (upgraded from Vista to 7), and now you can't use the 2 monitors you used before?
No hardware changes???
~Then the Drivers are left to be checked out...
When you have both monitors connected, what appears on the "left" and "right" monitor?
My System SpecsSystem Spec
22 Dec 2012   #17
Kevin86

Windows 7 64bit
 
 

No sorry, I bought a brand new pc. When both monitors are connected my desktop is cloned on to both monitors.
My System SpecsSystem Spec
22 Dec 2012   #18
petko131

Windows 7 x86 Ultimate
 
 

Quote   Quote: Originally Posted by Kevin86 View Post
No sorry, I bought a brand new pc. When both monitors are connected my desktop is cloned on to both monitors.
Ok, then i didn't read carefully the first post.
As alphanumeric said:
Quote   Quote: Originally Posted by alphanumeric View Post
You mentioned a "VGA splitter" ... it just sends the same VGA signal to two monitors at once. One monitor will mirror the other. If so, to use dual displays each monitor must be on a separate video connector on your video card. Each monitor needs its own source.
It's 100% true, but, then i can't explain how it worked on the vista PC?????
My System SpecsSystem Spec
22 Dec 2012   #19
Kevin86

Windows 7 64bit
 
 

Using Vista I used a DVI splitter and it worked fine. Could that be the reason?
My System SpecsSystem Spec
22 Dec 2012   #20
petko131

Windows 7 x86 Ultimate
 
 

Quote   Quote: Originally Posted by Kevin86 View Post
Using Vista I used a DVI splitter and it worked fine. Could that be the reason?
"DVI is better than VGA for TFTs because they are digital and VGA is analog. A TFT displayes its picture digitally, pixel per pixel. Via DVI the panel gets data for each pixel, so the picture generated in the graphics card will match exact with the pixels on the panel itself.

Not so with VGA. First, the picture is generated digitally in the graphics card. Then it's converted to analog. In the TFT they will be converted again to digital (=> senseless twice conversion => quality loss), using the phase and the clock, and it'll be calculated which pixel should display what color. As the phase and clock can't be adjusted so precisely that a pixel of a picture generated by the graphics card will be displayed by the appropriate pixel on the panel. Means that the picture will be interpolated a little bit, which again means quality loss.

The electron cannons of the CRT need analog signals, that's why VGA is the best for CRTs and DVI would make no sense here.
For TFTs, DVI is the best. I won't get a TFT with no DVI."

This is from the internet, think that the VGA output has not enough quality for the 2 monitors... can you try connecting the 1st monitor to the VGA (with out splitter), and the 2nd to the HDMI (if you have a cable, but your monitor doesn't support it, try connecting it to a tv )
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 Windows 7 doesn't recognize second monitor.




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