Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: Can't add a second monitor with GeForce 9400GT

18 Aug 2009   #1

Windows 7
Can't add a second monitor with GeForce 9400GT

Hi all,

As per title, I have been trying to get my dual monitors working on my Windows 7 machine. It used to work under XP but now with both monitors plugged in, I get no mouse curser on the log in screen, and after logging in, the screen goes blank. The second monitor (VGA) doesnt even show the POST startup and never gets any input. If I unplug the primary monitor (DVI) the second (VGA) monitor works and vice versa.

I have installed the latest Nvidia drivers but no change.

Any ideas please anyone?


My System SpecsSystem Spec

19 Aug 2009   #2

Windows 7

Anybody? Pleeeease !!!! I have been pulling my hair out for two days now !!!

I am now wondering if it's worth me buying a new video card or will I have the same problem?
My System SpecsSystem Spec
26 Aug 2009   #3

Windows 7 64

Hi Snoopstar,

I have a very similar problem with an EVGA 9400GT on Windows 7 64. My dual dvi monitors worked under Vista 64. With Windows 7 the second DVI port refuses to put out a digital signal. I still have no working secondary monitor under Win 7.

I'm becoming convinced the NVIDIA drivers are to blame...

You can see the extensive troubleshooting that I've been through by visiting the thread on Technet below. (different cables, monitors, every driver know to man etc)

There are more and more people with this problem it seems.... Could be time for an ATI card
My System SpecsSystem Spec


 Can't add a second monitor with GeForce 9400GT

Thread Tools

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 02:30 PM.
Twitter Facebook Google+

Windows 7 Forums

Seven Forums Android App Seven Forums IOS App

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33