The most common multi-monitor problems, and how to fix them

Multiple monitors have all sorts of advantages — even over single, enormous ultrawides — from improving productivity to providing versatility in their placement on your desk. But the experience isn’t always perfect. Sometimes you plug in a second monitor and it doesn’t work at all, or it keeps minimizing your game when you move into it accidentally.

If you’ve followed our guide on how to set up multiple monitors and you’re running into difficulties, check out the list below of the most common multi-monitor problems, and how to fix them in Windows 10.

No signal

Although getting no “signal” to your new monitor can be cause for concern, it’s arguably the easiest problem to fix. It simply means that the display has power but it isn’t receiving visual data. There are a number of reasons why this happens and plenty of fixes you can try to sort it out.

Force Windows to detect your monitor – Maybe Windows didn’t recognize your second display’s connection. To force it to check again, right-click the desktop and select Display Settings from the resulting pop-up menu. In the following window, click the Detect button located under the display diagram.

Turn the screen off and on – Some connection types don’t like hot swapping while a monitor is powered on. Turn the display off and then on again. That may be all it needs to recognize the video feed and start displaying it correctly.

Verify cable connections – A loose cable can cause “no signal” errors more often than any other problem. If they do seem well secured, unplug and plug them in again just to be sure.

Verify the correct input – Monitors with multiple input options need you to manually select which cable (port) you’re using, like HDMI 1, HDMI 2, DisplayPort, and so on. Use the buttons on your monitor to cycle through these “channels” and select the correct input from your PC.

Change data cable – If you’re using an older cable standard like VGA or DVI-D, you might want to try a newer alternative like HDMI or DisplayPort. You can also try using a new cable in case the old one has issues (bent pins, a short, exposed wire, etc.).

Change the graphics port – If you’re using a dedicated graphics card with multiple output ports, try switching to another port. Sometimes ports themselves can go bad or somehow get damaged. Switching to another is all you need to do to correct the problem.

Update your drivers – Windows 10 supports multiple monitors by default, but your current setup may not be configured correctly. Making sure you’re running the latest graphics drivers for your system can sometimes fix problems with no signal errors.

If you’re still having trouble with the additional monitor, verify that it works by unplugging the primary screen and double-checking the above steps again. If it does, consider running it as the primary display until you determine the root problem. If it doesn’t, contact your retailer or manufacturer to discuss a return or replacement.

Wrong resolution

Windows 10 Change Display Resolution

If you add a new, higher-resolution monitor to your system and find that it’s not displaying correctly, it might be borrowing settings from an older display, or simply trying to match your primary screen.

Step 1: Right-click your desktop and select the Display Settings option on the resulting pop-up menu.

Step 2: The Settings app opens with the Display panel loaded by default. Click on the secondary display shown in the diagram.

Step 3: With your secondary screen highlighted, scroll down to Scale and Layout and click the drop-down menu located under Display Resolution.

Step 4: Select a screen resolution that works best for you. Windows 10 designates one of these resolutions as “recommended” based on the display’s hardware.

If this didn’t work, make sure your monitor and graphics card can run at your chosen resolution. If you’re still running into problems, try updating your graphics drivers.

Wrong refresh rate

Windows 10 Change Refresh Rate

If your monitor is set at an incorrect refresh rate, it will display a “no signal” error. That means the PC is outputting a signal the display simply can’t handle, requiring you to manually adjust the output in Windows 10.

Step 1: Right-click your desktop and select the Display Settings option on the resulting pop-up menu.

Step 2: The Settings app opens with the Display panel loaded by default. Scroll down and click the Advanced Display Settings link located under Multiple Displays.

Step 3: On the following screen, click the drop-down menu located under Choose Display and select the problematic monitor.

Step 4: Under Display Information, click the Display Adapter Properties for Display # link.

Step 5: In the following pop-up window, click the Monitor tab.

Step 6: Under Monitor Settings, use the drop-down menu to select another refresh rate.

You can double-check what refresh rate your monitor is running at with the Testufo tool.

Duplicate or extended

There are a few different ways to display content on two screens, but Duplicate is often the default. If your second display merely copies the desktop rather than extend it, here’s how to change that view.

Step 1: Press the Windows + P keys to load the Project menu.

Step 2: Select the Extend option. You can do this by using your mouse, going up or down with the arrow keys and pressing Enter, or by pressing the Windows + P keys to cycle through options.

Alternatively, you can take the long route:

Step 1: Right-click your desktop and select the Display Settings option on the resulting pop-up menu.

Step 2: The Settings app opens with the Display panel loaded by default. Select your secondary monitor shown in the diagram.

Step 3: With your second screen highlighted, scroll down to Multiple Displays and select Extend Desktop to This Display on the drop-down menu.

Step 4: Go back up to the diagram and use your mouse to drag your second monitor to the left or right of your primary screen.

These same processes can be used to change to duplicate if you’d prefer it that way.

Games keep minimizing

If you find that your games keep minimizing when playing on a single monitor, you might be accidentally clicking in the pane of your second display. Some games don’t lock the boundaries of their fullscreen window, which means that when you move to the edge of the screen, your pointer can transition into the second window.

Clicking selects that second screen, or whatever is on it, minimizing the game. This is particularly problematic in games without a mouse pointer, like first-person shooters. Here are a few methods for fixing the minimization problem:

Check your display options within the game itself – If you’re playing in “Windowed” mode, try switching to “Full Screen” instead, as it captures your mouse. If that doesn’t work, try switching to “Borderless Window” mode. It won’t stop your mouse from moving into the other screen, but it can stop the game from minimizing when it happens. You’ll just need to click back into the game window.

Use a third-party app – Applications like the Dual Monitor Tool can let you lock a mouse pointer to a specific monitor. Just remember to unlock the mouse when you’re done.

Turn off the second screen – It’s a little drastic, but turning off the second screen when playing games that don’t need it prevents you from drifting into that extended space mid-game. Simply press the display’s power button, or press the Windows + P keys and select the PC Screen Only option.

Now that your multiple monitors are all working correctly, make sure you get a good dual-screen wallpaper for them.

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