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Dual Monitor Issue

I think I'm being dense here, but here is my issue. Customer has an HP 500B Microtower with 2 Hannspree monitors. It had an older Nvida video card with a DVI/HDMI/DisplayPort. Recently the monitor connected to the displayport stopped working. The owner thought he was pulling that wire when he used his standing desk.

I purchased a Nvida 710 card and assumed that I would just use the VGA port on the new card. No go. The second monitor would not be recognized even though it appears to be set to autodetect. Both monitors work if plugged into the DVI port.

I know I'm missing the obvious but any help would be appreciated.
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genusys
Asked:
genusys
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3 Solutions
 
Norm DickinsonGuruCommented:
Make sure that the monitor works on VGA on another computer. Try swapping the two monitors to see if that changes anything.
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crystal (strive4peace) - Microsoft MVP, AccessRemote Training and ProgrammingCommented:
I use an old NVIDIA card with 2 ports -- and sometimes when I travel, one of the monitors quits working for awhile ... but it has always (so far!) come back eventually.  Did the person with issues recently transport the system?

Perhaps clean the card? (although this wouldn't explain your problem with a new card) -- I prefer to vacuum, since I have attachments for little places, but taking it outside (so dust doesn't just eventually go back in) and using canned air works wonders.  Electronics don't like dust.

And then, it could be the cable ... perhaps try a different one? -- that would also explain why the monitor works in another port.  The cable is probably bad.
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Craig BeckCommented:
VGA port working on the second monitor?
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David Johnson, CD, MVPOwnerCommented:
if the both monitors are plugged in and powered on but one monitor is black (or showing no signal) you may have to go into the display properties, if it shows only one monitor press 'detect' and the missing monitor should be shown. then you can change the properties to extend,clone, mirror, move the monitors on the display properties screen to match the physical locations
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Norm DickinsonGuruCommented:
You should also try cycling thru the input selector on the monitors themselves and not rely on auto-detect, especially for VGA.
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John TsioumprisSoftware & Systems EngineerCommented:
Have you installed NVIDIA drivers?...go to its control panel(NVIDIA)  and check the multiple screens setting.
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genusysAuthor Commented:
Norm:
Didn't have second PC available. I'll check that today.
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genusysAuthor Commented:
Craig:

No.
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Craig BeckCommented:
So it's the monitor then.
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crystal (strive4peace) - Microsoft MVP, AccessRemote Training and ProgrammingCommented:
NVIDIA drivers: good point. Because Windows sometimes overwrites the video driver, I have the NVIDIA GetForce Experience program pinned to my taskbar!

did you try another cable between the monitor and computer?
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genusysAuthor Commented:
Crystal:

Cable is new and ok. I'm going to try the drivers. I can't get back to the customer till Friday
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crystal (strive4peace) - Microsoft MVP, AccessRemote Training and ProgrammingCommented:
try the cable with another monitor ... sometimes new things don't work. At least eliminate that as a possibility
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Craig BeckCommented:
Has the monitor been tried just on its own with all inputs one-by-one?  If none work it's the monitor.
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jdmailnyCommented:
Go into device manager and uninstall the montors from there, unplug cables and then plug back in.
The system should re discovery everything.
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