How to Connect Your Computer to a TV

The connection depends on which ports your computer and TV both have

You can connect a computer to a TV using an HDMI cable, a DisplayPort cable, a USB-C cable, or an older standard like VGA or DVI — whichever your devices support. HDMI is the most common choice because nearly every TV made in the last 15 years has an HDMI port, and most computers have one too. The cable itself costs $10 to $30 depending on length and quality. Once plugged in, your TV usually recognizes the computer automatically, though you may need to switch the TV to the correct input and adjust display settings on your computer.

The physical connection is only the first step. After the cable is in place, you'll need to tell your computer whether to mirror the display (show the same thing on both screens), extend it (use the TV as a second monitor), or use only the TV. You may also need to adjust the resolution so the image looks sharp on the TV's larger screen.

Key Takeaways

HDMI is the standard connection for most computers and TVs made after 2010, and the cable costs between $10 and $30.
After connecting the cable, switch your TV to the correct HDMI input using the remote, then check your computer's display settings to confirm the TV is recognized.
You can mirror your computer screen to the TV, extend your display across both screens, or use only the TV as your monitor.
If your computer or TV lacks HDMI, you may need an adapter cable or a wireless casting device like Chromecast or AirPlay, which add $20 to $60 to the cost.

HDMI is the easiest connection for most setups

HDMI (High-Definition Multimedia Interface) carries both video and audio through a single cable, so you don't need separate speaker wires. One end plugs into your computer's HDMI port, and the other end plugs into any HDMI port on your TV. Most TVs have two to four HDMI ports on the back or side. Most desktop computers have at least one HDMI port; laptops vary — some have HDMI, some have USB-C or Thunderbolt, and some have neither.

Once the cable is connected, pick up your TV remote and press the Input or Source button. A menu will appear showing all available inputs: HDMI 1, HDMI 2, HDMI 3, and so on. Select the HDMI port where you plugged in the cable. Your TV should then display your computer's desktop. If it doesn't, restart your computer or unplug the cable and plug it back in.

What to do if your computer doesn't have HDMI

Laptops and some smaller computers use USB-C or Thunderbolt instead of HDMI. If your computer has USB-C, you can buy a USB-C to HDMI adapter cable for $15 to $25. Plug the USB-C end into your computer and the HDMI end into the TV, just as you would with a standard HDMI cable. The process works the same way: switch the TV to the correct input and your desktop appears.

Older computers may have DisplayPort, DVI, or VGA ports instead. DisplayPort to HDMI adapters cost $15 to $30. DVI and VGA adapters are cheaper ($10 to $20) but less common on new TVs — you may need to check your TV's ports before buying an adapter. If your TV has no matching port at all, a wireless casting device like Google Chromecast ($30 to $50) or Amazon Fire Stick ($25 to $55) lets you send video to the TV without a cable, though the setup process is different.

Switching between mirror, extend, and TV-only modes

Once the TV is connected and recognized, your computer is in one of three modes. Mirror mode shows the same image on both your computer screen and the TV — useful for presentations or watching video with someone else. Extend mode treats the TV as a second monitor, so you can drag windows between screens and use more workspace. TV-only mode turns off your computer's built-in display and uses only the TV.

On Windows, right-click the desktop and select Display Settings. Scroll down to the Multiple Displays section. You'll see options to Extend, Duplicate, or Show Only On 1 or Show Only On 2. Choose whichever matches what you want to do. On Mac, open System Settings, click Displays, and select the Arrangement tab to choose how the screens relate to each other.

Adjusting resolution so the image looks sharp

When you first connect a TV, the image may look blurry or stretched because your computer is sending a resolution that doesn't match the TV's native size. TVs are typically 1920 × 1080 pixels (Full HD) or 3840 × 2160 pixels (4K), while computer monitors are often 2560 × 1440 or higher. Your computer may default to a resolution that doesn't fit the TV perfectly.

On Windows, go back to Display Settings and look for the Resolution dropdown under the TV's name. Select the highest resolution available — that's usually the TV's native resolution and will look sharpest. On Mac, open System Settings, click Displays, and select the resolution marked "Default for display." If the text looks too small after changing resolution, you can increase the text size separately without changing the resolution itself.

Wireless casting as an alternative to cables

If running a cable across your room isn't practical, you can cast your screen wirelessly. Google Chromecast, Amazon Fire Stick, and Apple AirPlay all let you send video from your computer to a TV without a physical connection. Chromecast works with Windows, Mac, and Linux. AirPlay works only with Mac and iPad. Fire Stick works with Windows, Mac, and Android.

Wireless casting is slower than a cable connection — there's usually a half-second delay between what you do on your computer and what appears on the TV — so it's not ideal for gaming or fast-paced work. It also requires your computer and TV to be on the same Wi-Fi network. The device itself costs $25 to $55, plus the cost of a power cable and HDMI cable to connect it to the TV. For a permanent setup, a cable connection is usually simpler and faster.

Troubleshooting when the TV doesn't recognize the connection

If you plug in the cable and the TV stays black, start with the simplest fixes. Make sure you switched the TV to the correct HDMI input — this is the most common reason the screen stays blank. Unplug the cable from both ends and plug it back in firmly. Restart your computer. If you're using an adapter, try a different USB-C or DisplayPort port on your computer if it has more than one.

If the TV still doesn't recognize the connection, the cable itself may be faulty. Borrow a cable from a friend or buy a new one to test. If a different cable works, the original cable is the problem. If the TV still doesn't recognize any cable, check your computer's display settings to see whether it detects an external display at all. On Windows, right-click the desktop and select Display Settings; if the TV doesn't appear under Multiple Displays, your computer's video port may be damaged and you may need to use a USB-C or wireless casting option instead.

Frequently Asked Questions

Can I use any HDMI cable, or do I need a special one?

Any standard HDMI cable works fine. You don't need to buy an expensive "premium" cable — a $10 cable from any electronics store works the same as a $50 one. The only exception is if you're connecting over a very long distance (more than 50 feet), in which case a thicker cable may help prevent signal loss.

Will connecting my computer to the TV damage either device?

No. HDMI is designed to be plugged and unplugged repeatedly without harm. The only risk is if you force the cable in at an angle — always align the connector straight before pushing it in. Once plugged in, the connection is safe to leave connected indefinitely.

Do I need to buy a new TV to connect my computer?

No. Any TV made after 2010 has at least one HDMI port and can connect to a computer. If your TV is older and has only VGA or component ports, you can still connect with an adapter cable, though the image quality will be lower than HDMI.

Can I use the TV as my main monitor instead of a computer monitor?

Yes, but TVs are not ideal for this. They have lower pixel density than monitors, so text looks blurry at normal viewing distances. If you sit close to the screen for work, a monitor is better. If you sit far away and mainly watch video or presentations, a TV works fine.

What's the difference between mirroring and extending?

Mirroring shows the same image on both screens — useful for presentations where the audience watches the TV while you work on your computer. Extending treats the TV as a second workspace, so you can drag windows to it and use more screen space at once.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.