How to Connect a Mac to a Monitor

What cable you need depends on your Mac's ports

The cable that connects your Mac to a monitor is determined by which ports your Mac has, not by the monitor itself. Macs made in the last ten years use either USB-C, Thunderbolt (which looks identical to USB-C), or HDMI. Your monitor likely has HDMI, DisplayPort, or USB-C. The mismatch between what your Mac outputs and what your monitor accepts is why you may need an adapter.

Start by identifying your Mac's ports. Look at the sides of your laptop or the back of your desktop Mac. USB-C and Thunderbolt ports are small, oval-shaped, and often silver. HDMI ports are larger, flat, and rectangular. If you are unsure, go to the Apple menu in the top left, select About This Mac, then System Report, and look for "Graphics" — this will tell you what video output your Mac supports.

Next, check what ports your monitor has. Look at the back or sides of the monitor. Most monitors made in the last five years have at least one HDMI port. Many also have DisplayPort, which is a smaller, rectangular port. Some newer monitors have USB-C. Write down which ports you see — you will need this information to choose the right cable or adapter.

Key Takeaways

Your Mac's port type (USB-C, Thunderbolt, or HDMI) determines what cable or adapter you need, not the monitor's brand or size.
Most Macs from 2016 onward use USB-C or Thunderbolt, which require an adapter to connect to standard HDMI monitors.
You can find your Mac's video output type in System Report under Graphics, and your monitor's ports by looking at the back panel.
A single USB-C to HDMI adapter costs between $15 and $30 and works with nearly all modern Macs and monitors.
Once connected, your Mac usually recognizes the monitor automatically; if it does not, restart your Mac or check System Preferences under Displays.

Connecting a Mac with USB-C or Thunderbolt to an HDMI monitor

If your Mac has USB-C or Thunderbolt ports and your monitor has HDMI, you need a USB-C to HDMI adapter. This is the most common scenario for MacBook Air and MacBook Pro owners. Plug the USB-C end into your Mac and the HDMI end into the monitor. Your Mac should detect the monitor within a few seconds.

If your Mac has multiple USB-C ports, any of them will work. You do not need to use a specific port. However, if you are also charging your Mac, using a port on the opposite side of the laptop from your charging cable will make the setup less cramped.

If the monitor does not appear after 10 seconds, disconnect the cable and reconnect it. If it still does not appear, restart your Mac. Go to the Apple menu, select Restart, and wait for your Mac to boot back up. Then reconnect the monitor. In rare cases, you may need to update macOS — go to System Settings, then General, then Software Update.

Connecting a Mac with HDMI to any monitor

If your Mac has an HDMI port, you can connect directly to any monitor with an HDMI port using a standard HDMI cable. No adapter is needed. Plug one end into your Mac and the other into the monitor. The monitor should appear on your Mac's display within a few seconds.

Mac minis and some iMacs have HDMI ports. If you have an older Mac with Mini DisplayPort or Thunderbolt (not USB-C), you will need a Mini DisplayPort to HDMI adapter instead. These are less common now but still available online for $15 to $25.

Connecting to a USB-C or DisplayPort monitor

If your monitor has USB-C or DisplayPort and your Mac has USB-C or Thunderbolt, you can often connect directly without an adapter. A USB-C to USB-C cable or USB-C to DisplayPort cable will work. Check your monitor's manual to confirm which cable type it expects.

USB-C monitors have an advantage: they can charge your Mac at the same time they display video. If your monitor has USB-C power delivery rated for at least 60 watts, you can plug in one cable and both charge and display. This is especially useful for MacBook owners who want a cleaner desk.

If you use a USB-C monitor, make sure the cable is rated for video output. Not all USB-C cables carry video signals — some only carry power or data. The monitor's manual will specify which cable to use, or you can buy a cable labeled "USB-C video" or "USB-C DisplayPort".

Adjusting display settings after connecting

Once your monitor is connected and recognized, your Mac may automatically use it as your main display or as an extended display. To change how your displays work together, go to System Settings, then Displays. You will see options to arrange your displays, change resolution, and adjust brightness.

If you want to use only the monitor and close your MacBook, go to System Settings > Displays and look for an option labeled Arrangement. You can drag the display icons to match how your physical monitors are positioned. This helps when you move your cursor between screens.

To change the resolution, click on the monitor you want to adjust in the Displays settings, then select Resolution. Most monitors work best at their native resolution, which macOS usually sets automatically. If text looks blurry or too small, try a different resolution — macOS will show you the options available for that monitor.

Troubleshooting a monitor that does not appear

If you have connected the cable but your Mac does not recognize the monitor, try these steps in order. First, disconnect the cable, wait 10 seconds, and reconnect it. Second, restart your Mac. Third, try a different USB-C port if your Mac has more than one.

If you are using an adapter, the adapter itself may be faulty. Try borrowing a different USB-C to HDMI adapter from a friend or buying a replacement. Adapters are inexpensive and sometimes fail without warning. If a different adapter works, your original one is the problem.

If the monitor still does not appear, check that the monitor is powered on and set to the correct input. Most monitors have a button on the back or side that cycles through inputs — HDMI 1, HDMI 2, DisplayPort, USB-C, and so on. Press this button until you see "HDMI 1" or whichever input you plugged into displayed on the monitor's screen. If the monitor shows "No Signal", the input is set correctly but the Mac is not sending video — try restarting your Mac again.

Using multiple monitors with a Mac

Most Macs can connect to at least one external monitor. Newer MacBook Pro models can connect to two or more. If you want to use two monitors, you will need two cables or adapters, one for each monitor. Plug them into different USB-C ports on your Mac.

When you connect a second monitor, go to System Settings > Displays to arrange them. You can choose whether they extend your workspace (so you have more screen space) or mirror your display (so both show the same thing). For most work, extending is more useful because it gives you room to spread windows across both screens.

If your Mac does not recognize the second monitor, disconnect the first one, connect the second one alone, and restart your Mac. Then reconnect the first one. Sometimes Macs need to see each monitor individually before they will work together.

Frequently Asked Questions

Do I need a special cable for a Mac, or will any HDMI cable work?

Any standard HDMI cable works with a Mac if your Mac has an HDMI port. If your Mac has USB-C or Thunderbolt, you need a USB-C to HDMI adapter, not a special Mac adapter — any brand works as long as it is USB-C to HDMI. Avoid very cheap adapters under $10, as they often fail quickly.

Can I connect my Mac to a TV instead of a monitor?

Yes. TVs have HDMI ports just like monitors do. Use the same USB-C to HDMI adapter or HDMI cable you would use for a monitor. The TV will work as a display, though it may have a slight delay when you move your cursor or type because TVs are not optimized for computer use. You can adjust the resolution in System Settings > Displays if text looks too small or blurry on the TV.

Will connecting a monitor slow down my Mac?

No. Connecting an external monitor does not slow down your Mac's processor or affect its performance. Your Mac may use slightly more power to drive the monitor, but this is negligible. The only time you might notice a difference is if you are running very demanding graphics work on both the Mac's built-in display and an external monitor at the same time.

What if my monitor has DisplayPort but my Mac only has USB-C?

You need a USB-C to DisplayPort adapter or cable. These cost $15 to $30 and work the same way as USB-C to HDMI adapters. Plug the USB-C end into your Mac and the DisplayPort end into the monitor. DisplayPort is less common than HDMI on monitors, so check your monitor's manual to confirm it has a DisplayPort input before buying an adapter.

Can I charge my Mac while it is connected to a monitor?

Yes, if your monitor has USB-C with power delivery. Some USB-C monitors can charge your Mac through the same cable that carries video. Check your monitor's specifications for "power delivery" and the wattage — it should be at least 60 watts to charge a MacBook. If your monitor does not have USB-C, you can still charge your Mac separately using its power adapter while the monitor is connected via HDMI or DisplayPort.

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.