Windows 8.1, dual monitor

I have a customer with Windows 8.  The computer updated to Win 8.1 and it now won't recognize the 2nd monitor - the computer thinks there is only one monitor in the Display menu.

Any suggestions?
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Pedro GamaCitrix AdminCommented:

I would bet is the pc's vga drivers. Try to perform a windows update or download updated graphics card drivers for windows 8.1

Hope it helps
PAMurilloAuthor Commented:
I visited the client in person.  He was using a USB/VGA adapter for the 2nd monitor.  I identified the mfr & model and downloaded an updated driver from them.

Everyone, thank you for your suggestions!

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PAMurilloAuthor Commented:
This was the correct solutions
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