[SOLVED] GeForce 9400GT and dual monitors problem

snoopstar · 08-22-2009, 04:44 AM

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? I was also thnking of getting a new card but dont want to find it wasnt the card at fault in Windows 7.

Thanks.

**emosun** · 08-22-2009, 05:11 AM

Does the card work fine on other operating systems? Windows 7 is not released yet and the drivers are very new.

snoopstar · 08-22-2009, 05:22 AM

Yes it worked ok in XP. I have downloaded the newest Windows 7 NVIDIA drivers for the card and no joy.

The other thing and I don't know if this is relevant, but on start up, I get no POST information on the VGA screen, only the DVI screen. When I had XP installed, both screens showed my startup information. As I understand it, surely it wouldn't matter what OS I was using at this point as the start up is from the bios still at this point? Or have I got that completely wrong?

On that note, I am wondering if I have somehow trashed the graphics card in between OS changes?

**emosun** · 08-22-2009, 03:11 PM

The only way to truly know would be to try xp again. But what you say is true that the bios should be uneffected by the os installed.

snoopstar · 08-23-2009, 02:27 AM

Thanks for your reply, thats what I thought. So last night I tried disconnecting my DVI monitor and just starting up with the VGA one connected.

It got as far as the POST and then windows start screen and then nothing. Screen went blank, no video signal and monitor went into standby mode.

So now I am really confused !!! Could this be a driver for the VGA side of the graphics card issue? IE VGA not working properly but DVI is?

**wrench97** · 08-23-2009, 04:56 AM

Try making the VGA port(The monitor that's hookrd to the Vga port) the primary in the graphics control panel. Reboot and see if that clears it up.

snoopstar · 08-23-2009, 08:04 AM

OK thanks, I will give that a try this evening.

snoopstar · 08-25-2009, 12:43 AM

I tried making the second vga monitor the primary but there was no option in the NVidia control panel for anything but my main monitor. regardless of what I tried , I couldn't get either windows to boot properly or the vga monitor to be recognised.

As a last attempt, I plugged in a different monitor into the VGA slot and boom, there it was straight away !!! After all this mucking about, it seems it is the monitor at fault! So just incase anyone is having similar problems, the monitor was mine.

It now all works perfectly on Windows 7 with the NVidia latest drivers. :) Finally ! ! !

**wrench97** · 08-25-2009, 01:49 AM

Good to hear you have it resolved.

08-22-2009, 04:44 AM	#1 (permalink)
snoopstar Registered User Join Date: Aug 2009 Posts: 5 OS: Windows 7	[SOLVED] GeForce 9400GT and dual monitors problem 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? I was also thnking of getting a new card but dont want to find it wasnt the card at fault in Windows 7. Thanks.

08-22-2009, 05:11 AM	#2 (permalink)
emosun Moderator Hardware Team Join Date: Oct 2006 Location: usa Posts: 7,088 OS: xp pro sp2 My System	Re: GeForce 9400GT and dual monitors problem Does the card work fine on other operating systems? Windows 7 is not released yet and the drivers are very new. __________________ Gpu Benchmarks Cpu-Z Power supply information and selection Gpu-Z Video card quick list

08-22-2009, 05:22 AM	#3 (permalink)
snoopstar Registered User Join Date: Aug 2009 Posts: 5 OS: Windows 7	Re: GeForce 9400GT and dual monitors problem Yes it worked ok in XP. I have downloaded the newest Windows 7 NVIDIA drivers for the card and no joy. The other thing and I don't know if this is relevant, but on start up, I get no POST information on the VGA screen, only the DVI screen. When I had XP installed, both screens showed my startup information. As I understand it, surely it wouldn't matter what OS I was using at this point as the start up is from the bios still at this point? Or have I got that completely wrong? On that note, I am wondering if I have somehow trashed the graphics card in between OS changes?

08-22-2009, 03:11 PM	#4 (permalink)
emosun Moderator Hardware Team Join Date: Oct 2006 Location: usa Posts: 7,088 OS: xp pro sp2 My System	Re: GeForce 9400GT and dual monitors problem The only way to truly know would be to try xp again. But what you say is true that the bios should be uneffected by the os installed. __________________ Gpu Benchmarks Cpu-Z Power supply information and selection Gpu-Z Video card quick list

08-23-2009, 02:27 AM	#5 (permalink)
snoopstar Registered User Join Date: Aug 2009 Posts: 5 OS: Windows 7	Re: GeForce 9400GT and dual monitors problem Thanks for your reply, thats what I thought. So last night I tried disconnecting my DVI monitor and just starting up with the VGA one connected. It got as far as the POST and then windows start screen and then nothing. Screen went blank, no video signal and monitor went into standby mode. So now I am really confused !!! Could this be a driver for the VGA side of the graphics card issue? IE VGA not working properly but DVI is?

08-23-2009, 04:56 AM	#6 (permalink)
wrench97 Moderator, Hardware Team Join Date: May 2008 Location: S.E. Pennsylvania Posts: 18,854 OS: Win7	Re: GeForce 9400GT and dual monitors problem Try making the VGA port(The monitor that's hookrd to the Vga port) the primary in the graphics control panel. Reboot and see if that clears it up. __________________ Power Supply and Selection

08-23-2009, 08:04 AM	#7 (permalink)
snoopstar Registered User Join Date: Aug 2009 Posts: 5 OS: Windows 7	Re: GeForce 9400GT and dual monitors problem OK thanks, I will give that a try this evening.

08-25-2009, 12:43 AM	#8 (permalink)
snoopstar Registered User Join Date: Aug 2009 Posts: 5 OS: Windows 7	Re: GeForce 9400GT and dual monitors problem I tried making the second vga monitor the primary but there was no option in the NVidia control panel for anything but my main monitor. regardless of what I tried , I couldn't get either windows to boot properly or the vga monitor to be recognised. As a last attempt, I plugged in a different monitor into the VGA slot and boom, there it was straight away !!! After all this mucking about, it seems it is the monitor at fault! So just incase anyone is having similar problems, the monitor was mine. It now all works perfectly on Windows 7 with the NVidia latest drivers. :) Finally ! ! !

08-25-2009, 01:49 AM	#9 (permalink)
wrench97 Moderator, Hardware Team Join Date: May 2008 Location: S.E. Pennsylvania Posts: 18,854 OS: Win7	Re: GeForce 9400GT and dual monitors problem Good to hear you have it resolved. __________________ Power Supply and Selection