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Windows 7: Dual monitor not recognized

29 Oct 2011   #1
Runnyeye

Windows 7 Ultimate 64-bit (6.1, Build 7601)
 
 
Dual monitor not recognized

Hello everyone,

I used to have 2 monitors connected to my pc, both working fine.
Now i got 2 new monitors (LG Flatron E2240) and i tried connecting them the same way as i had my previous monitors connected.
What i see is that both new monitors have a VGA-output. So i put a connector on them so i can connect them to the DVI-slots on my videocard (Radeon HD 6800).

Now i just cant seem to get a second monitor to work. It stays black, receives no signal and both windows 7 as CCC (AMD Engine Control Center latest version) do not recognize a second monitor.

Both monitors work fine if i connect them as a single monitor to my pc. Using the second slot on my videocard just doesnt seem to work.

I did install the drivers that came with the monitor, no effect.
Tried to use different resolutions on both monitors, no effect.
Tried looking for answers, but found nothing, so here i am ;-)

Hope anyone can help me and ofcourse willing to give extra info on this if needed.

Thanks allready!!!


My System SpecsSystem Spec
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29 Oct 2011   #2
stormy13
Microsoft MVP

Win 7 Ultimate x64
 
 

This the monitor.

E2240T | LG LED, Sincerely yours! | LG ELECTRONICS Nederland

It has both a VGA and a DVI port on it and you need to use the DVI connection on at least one of them. The reason that only one will work using the VGA connection is that the only one of the DVI ports on the video card supports a VGA connection via a VGA-DVI adapter.
My System SpecsSystem Spec
29 Oct 2011   #3
Runnyeye

Windows 7 Ultimate 64-bit (6.1, Build 7601)
 
 

Hi Stormy13,

thank you for your time and answer.
The monitor is not the correct one however, it is this one:
salland.eu | LG E2240S-PN 21.5 Inch / 54.6 Cm, 5 Ms, Zwart - E2240S-PN
it does not have any DVI :s


Cheers,
Runnyeye
My System SpecsSystem Spec
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29 Oct 2011   #4
stormy13
Microsoft MVP

Win 7 Ultimate x64
 
 

Only way you're going to get them to both work is to buy a DVI to VGA converter, an adapter just won't work. Either that or return the monitors if you can and get a pair that does have a DVI port on them.

As I said above your video card has two DVI ports on it, but only one of them will output/work with a VGA adapter, the other is DVI only. No idea if yours is marked as such (it should say in the manual, but sadly doesn't in a lot of cases) but a few of the card manufacturers mark the back panel bracket like this,

Dual monitor not recognized-backplate.png

to show which of the two supports VGA. You cannot get a VGA connection to work from the one not marked as such without using a converter as something has to change the signal from digital to analogue, and a regular VGA to DVI adapter just won't work.


My System SpecsSystem Spec
29 Oct 2011   #5
ReviverSoft

Windows 7 HP / Ultimate x64
 
 

Looks like stormy13 is right.

Take a look here:
AMD Game Forums - Dual Monitor Question (Radeon 6800 series)

As these monitors are brand new, you might want to return one of them for a monitor that does DVI. That's the most sensible option.
My System SpecsSystem Spec
29 Oct 2011   #6
Runnyeye

Windows 7 Ultimate 64-bit (6.1, Build 7601)
 
 

Yes, now i get it.

Thank you a lot for your answer Stormy13 (and ofcourse ReviverSoft)

Cheers,
Runnyeye
My System SpecsSystem Spec
29 Oct 2011   #7
henryeight

Windows7 home premium 32-bit
 
 

Really surprised your two monitors are "only" VGA - I though all production had moved-on....

Recently bought a second monitor s/h just in case my LCD blew and then tried use as dual-monitor. I thought it was VGA-only ( and that's why it was 25).... but on being informed it was "dual input" I looked under the sprung-loaded stand-thingy - and it does have DVI, so it's become a better product overnight!

I only used it for Video-Editing, but it's rubbish since the timeline is broken . . . . spread over two screens with a bit of duplication - not really a good answer, IMHO.
Still, it's a better "back-up" as DVI, compared with VGA.
My System SpecsSystem Spec
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