The fastest way depends on what ports your devices have

You can connect a computer to a TV using a cable that matches the ports on both devices, or wirelessly if your TV and computer support the same standard. The most common wired connections are HDMI (the fastest and easiest), DisplayPort, USB-C, or VGA (older computers and TVs). Wireless options include Miracast on Windows, AirPlay on Mac, or casting through apps like Chromecast or Roku.

Before you buy a cable or start troubleshooting, check what ports are actually on your computer and TV. Look at the back and sides of both devices—you'll see small rectangular or round openings labeled with symbols or text. Once you know what you have, the connection itself usually takes less than a minute.

Key Takeaways

  • HDMI is the standard connection for most modern computers and TVs and carries both picture and sound through one cable.
  • Check the ports on both your computer and TV first—they must match, or you'll need an adapter.
  • Wired connections are more reliable than wireless, especially for gaming or video playback.
  • If your computer and TV don't have matching ports, USB-C adapters and HDMI converters are inexpensive and widely available.
  • Wireless casting works well for presentations and casual viewing but may lag during fast-motion video or gaming.

Connecting with HDMI: the standard method

HDMI is the easiest connection because one cable carries both video and audio, and nearly every TV and modern computer has an HDMI port. The HDMI port looks like a small flat rectangle, wider than it is tall. Plug one end into your computer and the other into any HDMI port on your TV—it doesn't matter which port if your TV has multiple.

Turn on the TV and use the remote to select the correct input. Most TVs label inputs as "HDMI 1," "HDMI 2," and so on. You'll see a menu on screen showing all available inputs—select the one where you plugged in the cable. Your computer screen should appear on the TV within a few seconds. If it doesn't, restart your computer or try a different HDMI port on the TV.

If your computer doesn't have an HDMI port, look for USB-C or Thunderbolt (a port that looks like a small oval with lightning bolts). Both can carry HDMI signals through an adapter. A USB-C to HDMI adapter costs $10 to $25 and works when ready—no drivers or software needed.

Using DisplayPort or USB-C for newer computers

Newer laptops, especially from Dell, Lenovo, and Apple, often use USB-C or Thunderbolt instead of HDMI. These ports are smaller and more versatile. If your TV has a USB-C port (rare but increasingly common), you can plug directly in. Most TVs don't have USB-C, so you'll need a USB-C to HDMI adapter or a USB-C dock that includes HDMI.

A USB-C to HDMI adapter is a small, single-purpose device that costs $15 to $40. Plug it into your computer's USB-C port, then plug an HDMI cable into the adapter and into your TV. Some adapters also charge your computer at the same time, which is useful if your battery is low. Look for adapters labeled "USB-C to HDMI" or "Thunderbolt to HDMI" depending on your port type.

DisplayPort is less common on TVs but sometimes appears on computer monitors. If both your computer and TV have DisplayPort, you can use a DisplayPort cable directly. DisplayPort cables look similar to HDMI but have a small notch on one corner. They're usually more expensive than HDMI cables but carry the same signal quality.

Connecting older computers with VGA or DVI

Computers and TVs made before 2010 often use VGA or DVI ports instead of HDMI. VGA is a large port with three rows of small holes; DVI looks similar but is slightly wider. If your TV is very old, it may only have VGA. If your computer is old but your TV is newer, you'll need a converter.

A VGA to HDMI converter is a small box that costs $20 to $50. Plug the VGA cable from your computer into the converter, then plug an HDMI cable from the converter into your TV. The converter needs power—it usually comes with a USB cable you can plug into your computer or a wall outlet. Turn on the converter before selecting the TV input, or the TV won't detect the signal.

VGA and DVI cables carry only video, not audio. If you use one of these connections, you'll need to run a separate audio cable from your computer to your TV or speakers. Most modern TVs have a 3.5mm audio jack (headphone-sized) on the back. Plug a 3.5mm cable from your computer's headphone jack into the TV's audio input.

Wireless casting without cables

If your computer and TV both support wireless casting, you can skip the cables entirely. Windows computers support Miracast, which works with most modern TVs and streaming devices. On your Windows computer, press the Windows key and the K key at the same time, or go to Settings > System > Display > Connect to a wireless display. Your TV should appear in the list—click it to connect.

Mac computers use AirPlay, which works with Apple TV or AirPlay-compatible smart TVs. Click the Control Center icon in the top-right corner of your screen, then click Screen Mirroring and select your TV. The first time you connect, your Mac may ask for a code displayed on the TV—enter it to pair the devices.

Wireless casting is convenient for presentations and casual viewing, but it's slower than wired connections and may stutter during fast-motion video or gaming. If you're watching a movie or playing a game, a wired HDMI connection is more reliable. Wireless casting also drains your computer's battery faster than a wired connection.

Adjusting display settings after you connect

Once your TV shows your computer's screen, you may need to adjust how the display looks. Your computer might show the same image on both the laptop screen and TV (mirroring), or it might extend your desktop across both screens. To change this on Windows, right-click the desktop and select Display Settings, then choose "Duplicate these displays" or "Extend these displays."

On Mac, go to System Preferences > Displays and click the Arrangement tab. You can drag the display icons to match how your screens are physically positioned. If the image on the TV looks stretched or blurry, go back to Display Settings and check the resolution. Set it to match your TV's native resolution—usually 1920 × 1080 for a standard TV or 3840 × 2160 for a 4K TV.

If the TV image is too small or too large, check your TV's zoom or picture settings using the remote. Most TVs have a "Zoom" or "Picture Size" option in the menu. Set it to "Full" or "Fit to Screen" so the image fills the entire display without black bars.

Troubleshooting common connection problems

If your TV doesn't show your computer's screen after you plug in the cable, first check that you've selected the correct input on the TV. Use the remote to cycle through inputs until you see your computer's screen. If the TV still shows "No Signal," unplug the cable, wait 10 seconds, and plug it back in. Sometimes the connection needs to be reset.

If you're using an adapter and the TV still doesn't detect a signal, try a different USB-C port on your computer if you have one. Some ports may not support video output. If you have a desktop computer with multiple video ports, try plugging into a different port—some computers have both HDMI and DisplayPort, and you may have plugged into the wrong one.

For wireless casting, make sure your computer and TV are on the same Wi-Fi network. If they're on different networks, they can't communicate. Restart both devices and try again. If Miracast or AirPlay still doesn't work, check that your TV's casting feature is turned on—look in the TV's settings menu for "Screen Mirroring," "Miracast," or "AirPlay."

Frequently Asked Questions

Do I need a special cable for 4K video?

HDMI 2.0 and newer cables support 4K video at 60 frames per second. Most HDMI cables sold today are HDMI 2.0 or newer, so a standard cable will work. If you're buying a new cable specifically for 4K, look for one labeled "HDMI 2.0" or "HDMI 2.1" to be certain. Older HDMI cables from before 2013 may not support 4K.

Can I connect a computer to a TV wirelessly without a smart TV?

Yes, if you have a streaming device like Chromecast, Roku, or Apple TV connected to your TV. These devices have built-in wireless casting. Plug the device into your TV's HDMI port, connect it to your Wi-Fi, and then cast from your computer to the device. The TV itself doesn't need to be smart—the streaming device handles the connection.

Why is my computer screen showing on the TV but the sound isn't working?

If you're using HDMI, the sound should come through automatically. Check your TV's volume and make sure the input is set correctly. If you're using VGA or DVI, those cables don't carry audio—you need a separate 3.5mm audio cable from your computer to your TV. On your computer, go to Sound Settings and make sure the TV is selected as the audio output device.

Can I use a computer and TV at the same time without mirroring?

Yes. After you connect, go to Display Settings and choose "Extend these displays" instead of "Duplicate these displays." Your computer will treat the TV as a second monitor. You can drag windows between the two screens or use the TV to watch a video while you work on your computer screen.

What's the difference between HDMI and DisplayPort?

Both carry video and audio, but HDMI is more common on TVs and consumer devices, while DisplayPort is more common on computer monitors. HDMI cables are cheaper and more widely available. For connecting a computer to a TV, HDMI is the standard choice unless your TV specifically has a DisplayPort input, which is rare.