The three ways to connect: cable, wireless, or both

You can connect a computer to a TV using a physical cable, a wireless connection, or a combination of both. The best method depends on your computer type, your TV model, and how far apart they are. Most modern computers and TVs support at least one of these approaches, though older equipment may have fewer options.

Cable connections are the most reliable — they work immediately and don't drop signal. Wireless connections are more convenient if your computer and TV are far apart or you move between rooms. Many people use both: a cable for everyday use and wireless as a backup or for specific tasks like showing photos from across the room.

Key Takeaways

  • HDMI is the standard cable connection for both Windows and Mac computers, and nearly all TVs made in the last 15 years have at least one HDMI port.
  • Wireless options include Miracast (Windows), AirPlay (Mac and iPhone), and Chromecast (any device with a web browser), each working differently and requiring different setup steps.
  • Before you buy a cable or adapter, check what ports your computer actually has — many laptops use USB-C or Thunderbolt, which need an adapter to connect to HDMI.
  • Once connected, you can either mirror your screen (show the same thing on both) or extend it (use the TV as a second display for different content).

Using an HDMI cable: the straightforward approach

An HDMI cable is the simplest wired connection. One end plugs into your computer, the other into your TV. Most desktop computers and many older laptops have a full-size HDMI port. If your computer has one, you need only the cable itself — they cost between $5 and $15 depending on length.

Plug the cable in, and your TV should recognize the connection within a few seconds. Your computer may ask whether you want to mirror the display or extend it. If nothing appears on the TV, try pressing the input or source button on your TV remote and selecting HDMI. If your computer has multiple HDMI ports, try the other one.

The catch: many modern laptops, especially thin ones, don't have HDMI ports anymore. They use USB-C or Thunderbolt instead. In that case, you need an adapter — a small device that converts USB-C to HDMI. These cost $15 to $40 and are sold at any electronics store. Plug the adapter into your laptop's USB-C port, then plug the HDMI cable into the adapter.

Wireless connection on Windows: Miracast and casting

Windows computers can send video to a TV wirelessly using Miracast, a built-in feature that works with most modern TVs and streaming devices. Both your computer and TV must be on the same WiFi network. Open the Windows notification panel (bottom right of your screen), look for "Connect" or "Project", and select your TV from the list. The connection usually takes 5 to 10 seconds.

If your TV doesn't support Miracast directly, you can use a Chromecast device or a similar streaming stick plugged into your TV's HDMI port. Chromecast works with any Windows computer that has a web browser. Open Chrome, click the three-dot menu, select "Cast", and choose your Chromecast device. This method works for streaming video, photos, and some websites, though it may not work perfectly for all applications.

Miracast and Chromecast both have a slight delay — usually less than a second — so they work well for watching video or presentations but may feel sluggish if you're trying to play games or do detailed work that requires immediate response.

Wireless connection on Mac and iPhone: AirPlay

Mac computers and iPhones can send video to a TV using AirPlay, Apple's wireless standard. Your Mac and TV must be on the same WiFi network. Click the Control Center icon (top right of your Mac screen), select "Screen Mirroring", and choose your TV or Apple TV device from the list. The connection takes a few seconds.

AirPlay works with Apple TV devices and with some newer smart TVs that have AirPlay built in — Samsung, LG, and Sony models made in the last few years often support it. If your TV doesn't have AirPlay, you can buy an Apple TV device (the smallest model costs around $100) and plug it into your TV's HDMI port.

Like Miracast, AirPlay has a small delay but works smoothly for video, photos, and presentations. You can also use AirPlay to play audio through your TV's speakers while the screen shows something else.

Choosing between mirroring and extending your display

Once your computer is connected to your TV — by cable or wirelessly — you can choose what the TV shows. Mirroring displays exactly what's on your computer screen on the TV as well. This is useful for presentations, watching videos, or showing photos to a group.

Extending uses the TV as a second display. Your computer's taskbar and windows stay on your laptop or monitor, while the TV shows different content. You can drag windows between screens, which is useful if you want to watch a video on the TV while working on your computer. To switch between mirroring and extending, right-click your desktop (Windows) or open System Preferences > Displays (Mac) and look for display settings.

Troubleshooting when the connection doesn't work

If your TV doesn't show anything after you connect, start with these steps. First, make sure both devices are powered on and the TV is set to the correct input — use your remote to select HDMI or the specific port number where you plugged in the cable or device. Second, restart both your computer and TV. Third, if you're using wireless, check that both devices are on the same WiFi network.

For cable connections, try unplugging and replugging the cable or adapter. If you're using an adapter, make sure it's fully inserted into both the computer and the cable. For wireless connections, move your computer closer to the TV — interference from walls or other devices can weaken the signal. If the connection keeps dropping, try a cable instead, which is more stable over distance.

If you see a picture but the colors look wrong or the image is distorted, try adjusting the resolution. Right-click your desktop (Windows) or open System Preferences > Displays (Mac), look for resolution settings, and try a lower resolution. Some older TVs work better at specific resolutions like 1080p rather than 4K.

When to use cable versus wireless

Use a cable connection if your computer and TV are close together, you want the most reliable connection, or you plan to leave them connected for long periods. Cables don't use WiFi bandwidth and won't disconnect if someone else joins your network. They're also better for gaming or any task where a delay matters.

Use wireless if your computer and TV are far apart, you move between rooms, or you want to avoid running a cable across your space. Wireless is also better if multiple people need to connect different devices to the same TV — you can switch between a laptop, phone, and tablet without unplugging anything.

Many people use both: a cable for everyday use and wireless as a backup. If you have a streaming device like Chromecast or Apple TV already plugged in, wireless may be faster than hunting for an HDMI cable.

Frequently Asked Questions

Do I need to buy anything if my computer has HDMI?

Only an HDMI cable, which costs $5 to $15. If your computer doesn't have HDMI but has USB-C or Thunderbolt, you'll also need a USB-C to HDMI adapter ($15 to $40). Check your computer's ports before you buy anything.

Can I use the TV as a second monitor for work?

Yes, by extending your display instead of mirroring. Your computer will treat the TV as a separate screen, and you can drag windows between them. This works with both cable and wireless connections, though wireless may have a slight delay.

What if my TV is very old and doesn't have HDMI?

Older TVs with composite (red, white, yellow) or VGA ports can still connect to computers, but you'll need an adapter that converts HDMI or USB-C to those older standards. These adapters are less common and more expensive ($30 to $60). A cheaper option is to buy an inexpensive streaming device like Chromecast and use wireless instead.

Will connecting my computer to my TV slow down my WiFi?

Wireless connections use some WiFi bandwidth, but not enough to noticeably slow other devices unless your WiFi is already weak. If you notice buffering or lag, try moving closer to your router or using a cable connection instead.

Can I connect multiple computers to the same TV at once?

Only one at a time with a cable. With wireless, you can switch between devices quickly, but only one can display on the TV at a moment. Some streaming devices let you queue up content from multiple phones, but only one screen shows at a time.