PC not recognizing second monitor

[Hmag3]

My desktop is not recognizing my new ViewSonic monitor.  No monitor detected.  No input.

[Hawks_Eye]

@Hmag3,

Welcome to HP Support Community.

Thank you for posting your query, I will be glad to help you.

Let's go through some troubleshooting steps to get your HP Pavilion 31.5-inch All-in-One Desktop PC to recognize your ViewSonic monitor.
 

Check the Cable & Ports

• Ensure the HDMI (or DisplayPort) cable is securely connected to both your desktop and the ViewSonic monitor.
• Try a different cable if available.
• If your monitor has multiple input options (HDMI, DisplayPort, VGA), make sure it's set to the correct input source.

Restart & Detect Display

• Restart your PC and check if the monitor is recognized.
• Go to Settings > System > Display and click Detect under "Multiple displays."

Check Graphics Driver

• Update your graphics driver:
  1. Right-click Start, select Device Manager.
  2. Expand Display adapters.
  3. Right-click your GPU (Intel or NVIDIA) and select Update driver.
  4. Choose Search automatically for drivers.

Try a Different Port

• If your PC has multiple video output ports, try another one.
• If using a docking station or adapter, test connecting the monitor directly.

Test the Monitor

• Connect the ViewSonic monitor to another device (like a laptop) to check if it works.
• If the monitor is not displaying on another device, it could be a faulty monitor or cable.

Adjust Display Settings

• Right-click on the desktop, select Display settings.
• Scroll down to Multiple displays and try selecting Extend these displays.
• Ensure the correct resolution is set for the external monitor.

I hope this helps.

Take care and have a good day.

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Hawks_Eye

HP Support