The connection depends on what ports your laptop and monitor have

Most laptops connect to external monitors through one of four port types: HDMI, USB-C, DisplayPort, or an older standard called VGA. Your monitor has at least one of these same ports on its back or side. You match the port on your laptop to the port on your monitor, plug in a 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.

The process itself takes less than a minute. The harder part is figuring out which cable or adapter you actually need, because laptop manufacturers have stopped including these cables in the box. You'll almost certainly need to buy one separately, and buying the wrong type wastes money and time.

Key Takeaways

  • Check what ports are on your laptop and monitor before buying any cable — the most common types are HDMI, USB-C, and DisplayPort.
  • HDMI works with almost every monitor made in the last ten years and is the safest choice if you're unsure what your monitor accepts.
  • USB-C cables can carry video on newer laptops, but only if the monitor or cable specifically supports video — not all USB-C cables do.
  • If your laptop and monitor don't share a port, buy an adapter that converts from your laptop's port to your monitor's port, not the other way around.
  • After plugging in the cable, your laptop may need a few seconds to detect the monitor, and you might need to adjust display settings in your operating system.

Finding the ports on your laptop and monitor

Look at the sides and back of your laptop for rectangular or oval openings. On the left or right edge, you'll usually find at least one video port. On newer laptops, especially thin models, the only video port might be USB-C — a small oval connector that handles power, data, and video all in one.

On your monitor, look at the back panel or the underside of the stand. You'll see several ports clustered together. Most monitors have HDMI (a flat rectangular port), and many also have DisplayPort (a smaller rectangular port with a notch in one corner) or USB-C. Older monitors might only have VGA, which looks like a trapezoid with three small holes.

Write down what you see. If your laptop has HDMI and your monitor has HDMI, you're done — buy an HDMI cable. If they don't match, you need an adapter.

HDMI is the most common and reliable choice

HDMI (High-Definition Multimedia Interface) works with nearly every monitor sold in the last twelve years. If your laptop has an HDMI port, this is your easiest path. HDMI cables are cheap, widely available, and work the same way regardless of brand.

Most laptops with HDMI have a full-size HDMI port, not the smaller mini-HDMI or micro-HDMI variants. If your laptop has one of those smaller types, you'll need a cable or adapter specifically labeled for that size. Buy a cable rated for at least HDMI 2.0 — it's the same price as older versions and handles higher resolutions.

Plug the HDMI cable into your laptop's HDMI port, then into your monitor's HDMI port. If your monitor has multiple HDMI ports, it doesn't matter which one you use — just remember which one so you can switch back if you need to.

USB-C video works on newer laptops but requires the right cable

Many newer laptops, especially thin models from Apple, Dell, Lenovo, and ASUS, use USB-C as their only video output. USB-C is smaller and more versatile than HDMI, but not every USB-C cable carries video — some only carry power or data.

If your monitor has a USB-C port, check whether it supports video input. Look at the monitor's manual or the manufacturer's website and search for "USB-C video" or "USB-C DisplayPort". If it does, buy a USB-C cable rated for video. These are labeled as "USB-C with DP" (DisplayPort) or "Thunderbolt 3 compatible". Plug it into your laptop and monitor the same way you would with HDMI.

If your monitor doesn't have USB-C, or if you're not sure, buy a USB-C to HDMI adapter instead. This small device plugs into your laptop's USB-C port and has an HDMI port on the other end. Plug your HDMI cable into the adapter, then into the monitor. Make sure the adapter is rated for video — many cheap USB-C adapters only carry data, not video.

DisplayPort is common on gaming and professional monitors

DisplayPort is a video standard used mainly on gaming monitors, high-resolution displays, and professional workstations. It's less common on laptops than HDMI or USB-C, but some newer models include it.

If both your laptop and monitor have DisplayPort, use a DisplayPort cable. These are reliable and inexpensive. If your laptop has USB-C and your monitor has DisplayPort, a USB-C to DisplayPort adapter will work — USB-C on newer laptops often supports DisplayPort over USB-C, even if the port isn't labeled that way.

Do not buy a DisplayPort to HDMI adapter if you can avoid it. These adapters work in one direction only: from DisplayPort (the source) to HDMI (the display). If you try to use one backwards, it won't work.

Adapters: buying the right direction matters

An adapter converts one port type to another. The key rule is this: the port on your laptop is the source, and the port on your monitor is the destination. Buy an adapter that converts from your laptop's port to your monitor's port.

If your laptop has USB-C and your monitor has HDMI, buy a USB-C to HDMI adapter. If your laptop has USB-C and your monitor has DisplayPort, buy a USB-C to DisplayPort adapter. If you buy it backwards — HDMI to USB-C, for example — it won't work.

Adapters are cheap, usually between five and fifteen dollars. Buy from a reputable seller and check the reviews to make sure people are using it the same way you plan to. Avoid adapters labeled "universal" or "all-in-one" unless they specifically mention your exact port combination.

Plugging in the cable and adjusting your display settings

Once your cable or adapter is connected, plug the monitor's power cable into an outlet and turn it on. Then plug the video cable into your laptop. Your laptop should detect the monitor within a few seconds — you might see a brief notification or hear a sound.

On Windows, right-click on your desktop and select "Display settings". You should see both your laptop screen and your external monitor listed. If the external monitor doesn't appear, try unplugging and replugging the cable. If it still doesn't show up, restart your laptop.

On Mac, go to System Settings (or System Preferences on older versions), then Displays. Your external monitor should appear in the list. If it doesn't, unplug the cable, wait five seconds, and plug it back in.

Once your monitor is detected, you can choose whether to mirror your laptop screen (show the same image on both displays) or extend it (use the monitor as extra workspace). You can also adjust the resolution and refresh rate if your monitor supports higher settings than your laptop is currently using.

Troubleshooting when the monitor doesn't appear

If you've plugged everything in and the monitor still shows "No Signal", try these steps in order. First, unplug the video cable from both your laptop and monitor, wait ten seconds, and plug it back in. Sometimes the connection needs to be reset.

Second, check that you're using the correct input on your monitor. Most monitors have a button on the front or back that lets you switch between HDMI 1, HDMI 2, DisplayPort, and other inputs. Press this button and cycle through the options until you see your laptop's image. The monitor's manual will tell you which button to press.

Third, restart your laptop. This forces your operating system to re-detect the monitor and often fixes connection problems that software glitches caused.

If you're using an adapter, try a different adapter if you have one available. Cheap adapters sometimes fail, and it's worth testing before you assume the problem is with your laptop or monitor.

Frequently Asked Questions

Do I need to buy a cable, or does my laptop come with one?

Most laptops no longer include video cables in the box. You'll almost certainly need to buy one. HDMI cables are the cheapest and most widely available, usually between five and ten dollars. USB-C to HDMI adapters cost about the same.

Can I use any HDMI cable, or do I need a specific type?

Any HDMI cable works, but buy one rated for HDMI 2.0 or higher. These are the same price as older versions and handle higher resolutions and refresh rates. Avoid cables labeled "HDMI 1.4" or older — they're outdated and sometimes unreliable.

What if my monitor is older and only has VGA?

VGA is an older video standard that most new laptops don't support. You'll need a USB-C to VGA adapter or an HDMI to VGA adapter, depending on what ports your laptop has. These adapters are still available but less common than HDMI adapters. Check your laptop's ports first to see what you're working with.

Can I connect multiple monitors to my laptop at once?

Yes, but it depends on your laptop's ports and graphics hardware. Most laptops can support two external monitors if they have two video ports (like HDMI and USB-C). Some can support more with docking stations or hubs. Check your laptop's specifications or manual to see how many external displays it supports.

Why does my monitor say "No Signal" even though the cable is plugged in?

The monitor might be set to the wrong input. Press the input button on your monitor and cycle through HDMI 1, HDMI 2, DisplayPort, and other options until you see your laptop's image. If that doesn't work, unplug the cable, wait ten seconds, and plug it back in. If you're using an adapter, try a different one to rule out a faulty adapter.