The fastest way: match the cable to the port on your laptop
Your laptop connects to a monitor using a single cable. The cable type depends on which ports your laptop has. Most modern laptops have USB-C, HDMI, or DisplayPort. Your monitor has one or more of these same ports on the back. You match the laptop port to the monitor port, plug in the cable, and the image appears on the larger screen.
If your laptop and monitor don't share a port type, you'll need an adapter — a small device that converts one port type to another. Adapters cost between $10 and $30 and are sold at any electronics retailer. Once you have the right cable or adapter, the connection takes less than a minute.
Key Takeaways
- Check the ports on the back of your laptop and the back of your monitor to find a match — USB-C, HDMI, and DisplayPort are the most common.
- If the ports don't match, buy an adapter that converts from your laptop's port to your monitor's port.
- Plug the cable in, and your laptop screen will usually mirror on the monitor automatically, or you can choose to extend your display instead.
- If the monitor doesn't light up, restart your laptop and check that the monitor is powered on and set to the correct input source.
Finding the right cable: what ports look like and where they are
USB-C is a small oval port, about the size of a grain of rice. It's reversible — it works either way you insert it. Many newer laptops have USB-C, and some monitors do too. If both your laptop and monitor have USB-C, this is your simplest option. A USB-C to USB-C cable costs $10 to $20.
HDMI is a flat rectangular port, wider than it is tall. It's the standard on most older monitors and many laptops. An HDMI cable is cheap (under $15) and widely available. If your laptop has HDMI and your monitor has HDMI, use this connection.
DisplayPort is a small rectangular port with a notch in one corner. It's common on gaming monitors and high-end laptops. A DisplayPort cable costs $15 to $25. Some laptops have Mini DisplayPort, which is smaller — check your laptop's manual or look closely at the port shape.
Look at the back and sides of your laptop for these ports. Check the back and sides of your monitor as well. Write down which ports each device has. If they match, buy the corresponding cable. If they don't, you need an adapter.
Using an adapter when your ports don't match
An adapter is a small converter that lets you use a cable type your device doesn't natively support. For example, if your laptop has USB-C but your monitor only has HDMI, you'd buy a USB-C to HDMI adapter. The adapter plugs into your laptop, and then you plug an HDMI cable into the adapter and into the monitor.
Buy adapters from Amazon, Best Buy, Newegg, or any electronics store. Search for the exact conversion you need — for instance, "USB-C to HDMI adapter" or "DisplayPort to HDMI adapter". Read the reviews to confirm it works with your specific laptop model, because some adapters don't support video output on certain brands.
Avoid buying the cheapest option. Adapters under $10 often fail or produce a weak signal. Spend $15 to $30 for a reliable one. The money you save by buying cheap is lost the first time the adapter stops working.
Plugging in and turning on the display
Once you have the right cable or adapter, power on your monitor first. Look for a power button on the front or back. Then plug the cable into your laptop's port and into the monitor's port. The monitor should light up and show your laptop's screen within a few seconds.
If nothing appears, check that the monitor is set to the correct input source. Most monitors have an "Input" or "Source" button on the front. Press it and select the port you plugged the cable into — for example, "HDMI 1" or "DisplayPort". The image should appear when ready.
If the monitor still shows nothing, restart your laptop. Sometimes Windows or macOS needs to detect the new display. After restart, the image usually appears without any further action.
Choosing between mirror and extend mode
Mirror mode shows the same image on both your laptop screen and the monitor. This is the default on most systems. It's useful if you're presenting to others or want a larger view of the same workspace.
Extend mode treats the monitor as a second workspace. Your laptop screen shows one set of windows, and the monitor shows another. You can drag windows between them. Extend mode gives you more screen real estate for work.
On Windows, right-click the desktop and select "Display settings". Scroll down to "Multiple displays" and choose "Extend" or "Duplicate". On Mac, go to System Preferences > Displays, click "Arrangement", and check or uncheck "Mirror Displays". The change takes effect when ready.
Troubleshooting when the monitor won't show an image
If you've plugged everything in and the monitor is on but shows no image, work through these steps in order. First, make sure the monitor is powered on — look for a light on the front or back. Second, press the monitor's Input or Source button and confirm you've selected the correct port. Third, restart your laptop.
If the image still doesn't appear, try a different cable if you have one available. The cable itself may be faulty. If you're using an adapter, remove it and try a direct cable connection if possible — adapters are a common point of failure.
Check your laptop's display settings. On Windows, go to Settings > System > Display and look for "Multiple displays". On Mac, go to System Preferences > Displays. If the monitor isn't listed, your laptop isn't detecting it. Restart the laptop again, and if that doesn't work, the port on your laptop may be damaged and you may need a repair.
Frequently Asked Questions
Do I need to install drivers for the monitor to work?
No. Modern laptops and monitors work together without drivers. Plug in the cable, and the image appears. If you want to adjust color or resolution beyond the defaults, some monitors include a disc or software read, but this is optional and rarely necessary.
Can I use a USB hub to connect my monitor?
Not for video. A USB hub transfers data and power, not video signals. You must use a cable that carries video — HDMI, DisplayPort, USB-C with video support, or an adapter that converts to one of these. Check your USB-C cable's specs; not all USB-C cables support video.
What if my monitor has no ports that match my laptop?
Buy an adapter. Identify your laptop's port and your monitor's port, then search for an adapter that converts between them. For example, if your laptop has USB-C and your monitor has only VGA (an older round port), search "USB-C to VGA adapter". Confirm the adapter supports video output before buying.
Will connecting a monitor slow down my laptop?
No. The monitor is a display device only. It doesn't affect your laptop's processing speed or storage. Your laptop may use slightly more power to drive the larger display, but the difference is negligible on modern hardware.
Can I connect multiple monitors to one laptop?
Yes, if your laptop has multiple video ports or if you use adapters and hubs. Most laptops support at least two external displays. Check your laptop's manual or search "[your laptop model] multiple monitors" to confirm how many your specific model supports and which ports to use.