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Hello!<br />
<br />
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<br />
<br />
Hope it helps<br />
PG
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Hello!

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
PG

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This was the correct solutions
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Hi,<br />
I have a customer with Windows 8. &nbsp;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.<br />
<br />
Any suggestions?
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Hi,
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?

Windows 8.1, dual monitor

Windows 8 is a personal computer operating system developed by Microsoft as part of the Windows NT family of operating systems, with an emphasis on improving its user experience on tablets. In particular, these changes included a touch-optimized Windows shell based on Microsoft's "Metro" design language, the Start screen, a new platform for developing apps with an emphasis on touchscreen input, integration with online services, support for USB 3.0, Advanced Format hard drives, near field communications, and cloud computing. Additional security features were introduced, such as built-in antivirus software, integration with Microsoft SmartScreen phishing filtering service and support for UEFI Secure Boot on supported devices with UEFI firmware.

Windows 8

A monitor or a display is an electronic visual display for computers, usually comprised of the display device, circuitry, casing, and power supply. The display device in modern monitors is typically a thin film transistor liquid crystal display (TFT-LCD) thin panel, while older monitors used a cathode ray tube (CRT) about as deep as the screen size. They are connected to the computer via VGA, DVI, DisplayPort, Thunderbolt, LVDS or other proprietary connectors and signals.