Key Takeaways
- Most Dell monitors have HDMI, DisplayPort, or USB-C ports, so you can connect two monitors to the same computer if your graphics card has enough ports.
- Daisy-chaining (connecting one monitor to another) works only if both monitors support DisplayPort daisy-chaining, which you can check in the monitor's manual or specifications.
- If your computer does not have enough video ports, a USB-C docking station or USB hub can add the connections you need.
- Windows and Mac both let you arrange multiple monitors in display settings, so you can choose whether they extend your desktop or mirror the same image.
Check Your Dell Monitor's Ports and Specifications
Before you connect anything, look at the back of your Dell monitor and identify which ports it has. Most current Dell models include HDMI, DisplayPort, or USB-C. Some older models may have only VGA or DVI ports. Write down which ports you see — you will need this information to figure out what cables and adapters you need.
Next, check your monitor's manual or Dell's website to see if it supports DisplayPort daisy-chaining. Search for your exact model number (usually printed on the back or bottom of the monitor) and look for "daisy-chain" or "MST" (Multi-Stream Transport) in the specifications. If your monitor supports this, you can connect a second monitor directly to it instead of to your computer.
Running Two Monitors from Your Computer
The most straightforward setup is connecting both monitors to your computer at the same time. Check your graphics card or laptop to see how many video ports it has. Most modern laptops have at least one HDMI port and one USB-C port that supports video. Desktop computers usually have multiple ports on the graphics card itself.
If your computer does not have enough ports, use a USB-C docking station or USB hub that includes video outputs. Plug the dock into your computer, then connect each monitor to a separate port on the dock. This works well for laptops, which often have limited built-in ports. Make sure the dock you buy supports the resolution and refresh rate you want — check the specifications before purchasing.
Once both monitors are physically connected, your computer should detect them automatically. On Windows, right-click the desktop and select "Display settings." On Mac, go to System Preferences and choose "Displays." You can then arrange the monitors, choose whether to extend your desktop across both screens or mirror the same image on both, and adjust resolution and refresh rate for each one.
Daisy-Chaining Monitors Together
Daisy-chaining means connecting one monitor to your computer and the second monitor to the first monitor, using a single cable between them. This reduces cable clutter and uses only one port on your computer. However, it only works if both monitors support DisplayPort daisy-chaining — most Dell UltraSharp and P-series monitors do, but budget models often do not.
To daisy-chain, connect your computer to the first monitor using a DisplayPort cable. Then connect a second DisplayPort cable from the "out" port on the first monitor to the "in" port on the second monitor. Both monitors should light up and appear in your display settings. If the second monitor does not show up, check that daisy-chaining is enabled in the first monitor's on-screen menu — look for a setting called "DisplayPort 1.2" or "MST."
The main limitation of daisy-chaining is that it works only with DisplayPort, not HDMI or USB-C. If your monitors have only HDMI ports, you cannot daisy-chain them — you must connect both to your computer instead.
Cables and Adapters You Might Need
The cable you need depends on which ports your monitor and computer have. If both have DisplayPort, use a DisplayPort cable. If both have HDMI, use an HDMI cable. If one has USB-C and the other has HDMI, you will need a USB-C to HDMI adapter or cable.
Buy cables from a reputable electronics retailer rather than the cheapest option online — poor-quality cables can cause flickering, no signal, or intermittent disconnections. If you are unsure which cable to buy, take a photo of the ports on the back of your monitor and your computer, and ask a store employee which cable matches.
Troubleshooting When the Second Monitor Does Not Show Up
If you connect a second monitor and it does not appear in your display settings, start with the basics. Make sure the monitor is powered on — look for a light on the front or back. Check that the cable is fully inserted into both the monitor and your computer. Try a different cable if you have one available, since bad cables are the most common cause of this problem.
If the cable and power are both fine, restart your computer. Windows and Mac sometimes need a restart to detect a newly connected monitor. After restarting, go back to display settings and see if the monitor appears.
If the monitor still does not show up, check your graphics card or laptop manufacturer's website to see if you need a driver update. Older computers sometimes do not recognize newer monitors without an updated driver. You can also try connecting the monitor to a different port on your computer — some ports may not be active by default.
Choosing Between Side-by-Side and Daisy-Chain
Side-by-side (both monitors connected to your computer) is simpler and works with any monitor and any cable type. It is the best choice if your computer has enough ports or if you are willing to use a docking station. This setup also lets you use different monitor models and brands together without compatibility issues.
Daisy-chaining is cleaner and uses fewer cables, but it requires both monitors to support DisplayPort daisy-chaining and limits you to using DisplayPort cables. It is the better choice if you want to minimize cable clutter and both your monitors support it. If one monitor does not support daisy-chaining, you cannot use this setup.
Frequently Asked Questions
Can I connect a Dell monitor to a non-Dell monitor?
Yes. As long as both monitors have compatible ports — both HDMI, both DisplayPort, or a combination with the right adapter — you can connect them together or to the same computer. The monitors do not need to be the same brand or model.
What if my Dell monitor has only HDMI ports?
You can still run two monitors from your computer, but you cannot daisy-chain them since daisy-chaining requires DisplayPort. Connect both monitors directly to your computer using HDMI cables, or use a docking station if your computer does not have enough HDMI ports.
Will connecting two monitors slow down my computer?
No. Running two monitors uses slightly more graphics card power, but modern computers handle this easily. You may notice a small performance impact only if you are running demanding games or video editing software at high resolution on both screens simultaneously.
Do I need to buy a special cable to daisy-chain?
No, a standard DisplayPort cable works for daisy-chaining. Make sure both monitors have DisplayPort ports and that daisy-chaining is enabled in the first monitor's menu. Some older DisplayPort cables may not support daisy-chaining, so if it does not work, try a newer cable.
Can I use a USB-C monitor with an older Dell monitor that has only HDMI?
Yes, if your computer has both USB-C and HDMI ports, or if you use a docking station. Connect the USB-C monitor to the USB-C port and the HDMI monitor to the HDMI port. Both will work at the same time as long as your graphics card supports multiple outputs.