Cannot get video display on all three monitors

sasllc
sasllc used Ask the Experts™
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I can only use two of the three monitors at a time.

This is a Win7 Pro desktop PC with a GEForce 210 video card, with a VGA, HDMI, and DVI connector.  The primary monitor is connected to the HDMI port.   I have a DVI-VGA converter plugged into the DVI port.  If I connect all three monitors, one of the non-primary monitors will be black.  The 3rd monitor does appear on the Windows Screen resolution setup screen, but its icon is darker grey, and the Resolution and Orientation fields are greyed out.  The Multiple displays field says Disconnect this display, and no matter what I change it to from the dropdown, it ignores me and goes back to Disconnect this display.  

The Nvidia control panel only sees two monitors at a time, i.e. never three like Windows does, but if I disconnect one of the side monitors, then the Nvidia control panel "sees" the other side monitors and displays its model name correctly.  Note that I just now downloaded the latest driver for the GEForce 210 and rebooted.

Is this card incapable of running three monitors, or am I doing something wrong?  TIA
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Most Valuable Expert 2013

Commented:
The 210 only supports two independent displays . Additionally with most manufacturer's versions of this card it will only support dual monitor setups that use the VGA port (for example VGA + DVI or VGA + HDMI but not DVI + HDMI)

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Commented:
This PC does have one DP and one VGA port on the motherboard, but the only way I found that I could utilize those was by uninstalling the GEForce 210 driver and physically removing the 210 video card.  I think I've seen this happen before.  Is that typical--i.e. where you can use the video card ports or the motherboard ports, but not both?
Most Valuable Expert 2013
Commented:
The onboard video will typically be disabled in the system BIOS if a graphics card is detected.  For three independent displays you ideally would need to swap out your current card for one that can drive three screens - there are plenty about to fit a budget.  You could also consider a USB to video convertor to drive the third screen but this will reduce traffic through your USB hub and so could reduce the speed of other connected devices.

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