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Hi Paul, my name is ***** ***** welcome to JustAnswer!
If I understand correctly, this was working for you previously but has not worked since Windows 7 was reinstalled, is that correct?
Okay, at this point have you done anything to troubleshoot the issue beyond the information provided? Changed any settings, for instance?
Hmm, okay. I guess it won't be that simple then.
Are the two monitors connected exactly as they were previously?
Okay, gotcha. Strange. If the connections are the same and you've checked the driver and you've gone into the Control Panel then you should be okay. I can imagine this is pretty frustrating.
Can you tell me how exactly they're connected? As in, what kind of interfaces (VGI, DVI, HDMI, etc)?
Okay, thanks. I'm not seeing anything unusual there, aside from the fact that the second monitor is obviously not being detected.
Okay, typically on monitors the proper input has to be selected. For instance, it can be set to analog or digital or the options may be more specific than that. Have you gone into the monitor properties to make sure that the proper input is selected?
The monitor that's working you should have to worry about. But if the other one is set to an improper input it won't get picked up. So you may need manually switch it over.
Hmm, I see. Well man. . . Paul, I hate to say it but everything looks good to me and I can't imagine what the issue might be.
What I'm going to do at this point is opt out of the question and open it up to other experts so they can chime in here. You'll be notified when there's another response.
Hello there let me give it a go.It looks like you're using the Windows control to add the second monitor.I've found with Dells you need to over-ride the Windows controls by going to the resolution settings in the Control Panel and choosing "advanced settings'. Change the display mode there rather than in Windows. ie use the video cards control panel rather than Windows.
Please try a new USB cable if it is not working. You need to go in to the advance settings of the video card itself such as the NVIDIA if you have that. There should be a NVIDIA control panel that has installed besides the Windows display settings such as you describe
Hello there if it is Nvidia you should have an icon in the system tray for the Nvidia software that is installed along with the driver. If you right click this or select it from the Programs apps then you will have an option to see the Nvidia control panel
Please try right clicking or looking for the programme in the Programs app when you left click the bottom left corner icon.
It's in there that you will be able to access the Nividia control panel (not the Windows control panel)