The fastest way depends on what ports your devices have

The simplest connection uses a cable that matches the ports on both your computer and TV. Most modern TVs have HDMI ports, which carry both picture and sound in one cable. If your computer has an HDMI port, you can plug directly in—no setup needed beyond selecting the right input on your TV remote. If your computer lacks HDMI, you have two other common routes: a wireless connection using Miracast or AirPlay, or an adapter cable that converts your computer's port to HDMI.

The method you choose depends on three things: what ports your computer actually has, what ports your TV has, and whether you want a permanent setup or something you use occasionally. A cable connection is more reliable for video calls or gaming, while wireless works better if you move between rooms or want to avoid clutter.

Key Takeaways

  • HDMI is the standard cable connection—plug one end into your computer and one into your TV, then switch the TV to that HDMI input using the remote.
  • If your computer has USB-C or DisplayPort instead of HDMI, you can buy an adapter cable for $10 to $30 that converts to HDMI.
  • Wireless connections using Miracast (Windows) or AirPlay (Mac) work without cables but may have slight lag and require both devices on the same Wi-Fi network.
  • After connecting, you may need to adjust your display settings in Windows or macOS so the TV shows the same image or extends your desktop.
  • If the TV shows no picture, check that you selected the correct HDMI input on the TV remote, not the input for cable or satellite.

Finding the right cable or adapter for your computer

Look at the ports on the side or back of your computer. HDMI ports are rectangular and about the size of a USB port. DisplayPort ports are smaller and slightly rectangular. USB-C ports are small and oval-shaped. Thunderbolt ports on Macs look identical to USB-C but have a lightning bolt symbol next to them.

If your computer has HDMI, buy a standard HDMI cable (any brand works—they are all the same). If your computer has DisplayPort or USB-C, buy an adapter that says "USB-C to HDMI" or "DisplayPort to HDMI"—these cost $10 to $30 and work when ready. Avoid "HDMI to USB" adapters; they go the wrong direction and will not work.

On the TV side, look for HDMI ports on the back or side. Most TVs have two to four HDMI ports. It does not matter which one you use, but remember the number or label (HDMI 1, HDMI 2, etc.) because you will need to select it on the TV remote after plugging in.

Connecting with an HDMI cable

Plug one end of the HDMI cable into your computer's HDMI port. Plug the other end into any HDMI port on your TV. Turn on the TV if it is not already on.

Pick up the TV remote and press the input or source button. This button is usually near the top or side of the remote and may be labeled "Input," "Source," or have a symbol that looks like a rectangle with an arrow. A menu will appear showing all the inputs: Cable, Satellite, HDMI 1, HDMI 2, etc. Select the HDMI port you plugged into. The TV should now show your computer's screen.

If the TV stays black, try a different HDMI port on the TV. If that does not work, restart your computer with the cable still plugged in. If you still see nothing, the cable may be faulty—try borrowing another HDMI cable to test.

Using an adapter if your computer has USB-C or DisplayPort

Plug the adapter into your computer's USB-C or DisplayPort port. Plug an HDMI cable into the other end of the adapter, then plug that cable into your TV's HDMI port. Turn on the TV and select the correct HDMI input using the remote, just as you would with a direct HDMI cable.

Some USB-C adapters require power—they have a small USB power port on the side. If yours does, plug it into a USB power adapter (the kind that charges phones) or a powered USB hub. Without power, the adapter will not work. DisplayPort adapters rarely need power, but check the instructions that came with yours.

If the TV does not recognize the connection, try unplugging the adapter and plugging it back in. If you see a message on your computer asking you to authorize the connection, click yes. Some older computers may not support video over USB-C; if nothing appears after 30 seconds, that adapter type may not work with your machine.

Connecting wirelessly with Miracast or AirPlay

Wireless connection works if your TV supports Miracast (most Windows-compatible TVs made after 2015) or AirPlay (most Apple TVs and newer Samsung or LG TVs). Check your TV's manual or settings menu to confirm it has wireless casting built in.

On a Windows computer, right-click the desktop and look for "Display settings." Scroll down and click "Advanced display settings," then look for "Wireless display" or "Connect to a wireless display." Click that option and your computer will search for nearby TVs. Select your TV from the list. Windows will ask for permission; click yes. Your screen should appear on the TV within a few seconds.

On a Mac, click the Control Center icon (usually in the top right corner), then click "Screen Mirroring." Select your TV from the list. If your TV does not appear, make sure both your Mac and TV are on the same Wi-Fi network. Some older Macs may not support AirPlay to all TV brands; if your TV does not appear, a wired connection is more reliable.

Wireless connections work best when your computer and TV are in the same room and on the same Wi-Fi network. If the picture lags or drops out, move closer to the router or switch to a wired HDMI connection.

Adjusting display settings after you connect

Once the TV shows your screen, you may want to change how it displays. On Windows, right-click the desktop and select "Display settings." You will see options to extend your desktop (use the TV as a second monitor while keeping your computer monitor active) or duplicate it (show the same thing on both screens). Choose whichever suits your task. If the image looks stretched or cut off, scroll down to "Scale and layout" and try a different percentage.

On a Mac, go to System Settings, then Displays. You will see a dropdown menu that says "Arrangement." Choose "Mirror" to show the same image on both screens, or leave it unselected to extend your desktop. If the text looks too small or too large, adjust the resolution slider.

If the TV shows a black border around your image or cuts off the edges, this is usually a TV setting, not a computer setting. On your TV remote, look for a menu option called "Picture," "Display," or "Zoom." Inside that menu, find "Aspect Ratio" or "Screen Fit" and change it from "Zoom" to "Fit" or "Full." This tells the TV to show the entire image without cutting anything off.

Troubleshooting when the connection does not work

If you plugged in the cable but the TV shows no picture, first check that you selected the correct HDMI input on the TV remote. Many people accidentally leave the TV on Cable or Satellite input. Press the input button again and cycle through each HDMI option until you see your computer screen.

If the TV still shows nothing, try restarting your computer with the cable plugged in. Some computers do not detect the TV until they boot up with it already connected. Wait at least 30 seconds after restart before assuming it did not work.

If you are using an adapter, unplug it and plug it back in. Make sure the HDMI cable is fully inserted into both the adapter and the TV—a loose connection often looks like a dead connection. If you have access to another HDMI cable or adapter, try that to rule out a faulty cable.

For wireless connections, make sure both devices are on the same Wi-Fi network. Restart your router and your TV, then try connecting again. If your TV is very old, it may not support Miracast or AirPlay; check the manual or the TV's settings menu to confirm the feature is available.

When to use each connection type

Use a wired HDMI connection if you are working with video, playing games, or doing anything where a slight delay matters. Wired connections are also more stable if you have a weak Wi-Fi signal or many devices on your network.

Use a wireless connection if you move between rooms, want to avoid cables, or only connect occasionally. Wireless works well for presentations, watching videos, or browsing the web, where a 100-millisecond delay is not noticeable.

If you connect the same computer to the TV every day, a permanent HDMI cable is worth the small cost and eliminates troubleshooting. If you connect different devices or move around, wireless is more convenient despite the occasional need to reconnect.

Frequently Asked Questions

Do I need to buy a special HDMI cable?

No. Any HDMI cable works with any HDMI port. Expensive "premium" HDMI cables are not better than cheap ones for distances under 25 feet. Buy whatever is cheapest at your local electronics store or online.

Why does the picture look stretched or blurry on the TV?

This is usually a TV setting, not a computer problem. On your TV remote, find the menu option for "Picture," "Display," or "Aspect Ratio" and change it from "Zoom" to "Fit" or "Full." If the image is still blurry, your computer's resolution may not match the TV's native resolution; check Windows or macOS display settings and try a different resolution.

Can I use the TV as a second monitor while working?

Yes. In Windows, open Display Settings and choose "Extend" instead of "Duplicate." On a Mac, go to System Settings > Displays and leave "Arrangement" unchecked. Your computer monitor and TV will act as separate screens, and you can drag windows between them.

What if my computer has no HDMI port?

Buy an adapter that matches your computer's port type. USB-C to HDMI and DisplayPort to HDMI adapters cost $10 to $30 and work when ready. Plug the adapter into your computer, then plug an HDMI cable into the adapter and the TV.

Does wireless casting work if my TV is old?

Only if your TV has Miracast or AirPlay built in. Most TVs made after 2015 have one or both, but older models do not. Check your TV's manual or settings menu. If your TV does not support wireless casting, use an HDMI cable or adapter instead.