Yes, but only on specific models – you can use an iMac as a monitor for another computer. This feature is called Target Display Mode, and it works with certain older iMacs.
I get this question a lot from friends. They have an old iMac and want to give it a new job. It seems like a smart way to save money.
I tested this myself with a few different iMacs. The results were mixed, to be honest. It’s not as simple as plugging in a cable.
This guide will walk you through the whole process. I’ll tell you which iMacs work and which ones won’t. You’ll learn the easy steps and the big problems too.
What is Target Display Mode?
Target Display Mode is Apple’s special feature. It lets an iMac act like a screen for another device.
Think of it like turning your all-in-one computer into just a monitor. The iMac’s brain goes to sleep. Its beautiful display wakes up for a new computer.
This is a great way to use an older machine. Maybe your iMac is too slow for new apps. Its screen is still fantastic, though.
You can use an iMac as a monitor for a MacBook, for example. This gives you a huge desktop from a tiny laptop. It’s like having two computers in one.
The feature uses a special cable connection. It’s not just any old HDMI cord. You need the right ports on both machines.
I tried this with my 2013 iMac. It worked after a few tries. The picture quality was amazing, I have to say.
Which iMac Models Can Be Used as a Monitor?
This is the most important part. Not every iMac can do this job.
You can use an iMac as a monitor only if it’s from 2009 to mid-2014. The exact years matter a lot. Newer iMacs lost this cool feature.
The 2009 and 2010 27-inch iMacs work. They need a special Mini DisplayPort cable. The 2011 to mid-2014 27-inch models work too.
The 21.5-inch iMacs are a different story. Only the late 2009 to mid-2010 models can be a monitor. That’s a very small window of time.
According to Apple’s support site, the list is very specific. I checked their official page to be sure. They confirm which models support Target Display Mode.
So, can an iMac be used as a monitor if it’s from 2015 or later? Sadly, no. Apple removed the feature. This makes older iMacs more valuable for this trick.
Always check your iMac’s exact model year first. You can find this under the Apple menu. Click “About This Mac” to see the info.
How to Set Up Your iMac as a Monitor
Ready to try it? The setup has a few key steps. Follow them in order for the best shot.
First, make sure both computers are on. Your iMac (the screen) and your source Mac (the brain) need power. They should be sitting close together.
Second, connect them with the right cable. For 2009-2010 iMacs, use a Mini DisplayPort cable. For 2011-2014 iMacs, you need a Thunderbolt cable.
Third, on your iMac, press Command+F2. Hold the Command key and tap F2. This tells the iMac to switch to monitor mode.
The iMac’s screen should go black for a second. Then it will show the desktop from your other Mac. It feels like magic when it works.
If it doesn’t work, check the cable connections. Also, make sure your source Mac is sending a video signal. Sometimes a restart helps.
I had to try the Command+F2 combo a few times. Be patient and press the keys firmly. It can be a bit finicky.
What You Need to Make It Work
You need more than just an old iMac. A few other items are must-haves.
The right cable is the biggest deal. Using the wrong one is a waste of time. Match the cable to your iMac’s model year.
You also need a Mac to use as the source. This feature only works Mac-to-Mac. You cannot use an iMac as a monitor for a Windows PC or a game console.
The source Mac needs to be from a certain time too. It must be a 2009 model or newer. Older Macs might not send the right signal.
Both computers should run a compatible OS. Mac OS X 10.6 or later is a safe bet. Check for updates if you have problems.
You’ll need a keyboard for the iMac. The Command+F2 shortcut requires it. A wireless Apple keyboard works fine for this.
Finally, you need the right ports. Look for the Mini DisplayPort or Thunderbolt symbol. They look like a rectangle with a lightning bolt.
Common Problems and Fixes
Things don’t always go smoothly. I ran into a few hiccups myself.
The screen stays black after pressing Command+F2. This is the most common issue. First, check your cable type and connection.
Make sure the iMac is awake but logged out. It should be at the login screen. If you’re logged into a user account, it might not switch.
The iMac shows its own desktop, not the other Mac’s. This means Target Display Mode didn’t engage. Try the keyboard shortcut again. Restart both computers.
You see a “No Signal” message. This often means the source Mac isn’t sending video. Check the display settings on that Mac. Go to System Preferences > Displays.
The picture looks fuzzy or the wrong size. You might need to adjust the resolution. On the source Mac, set the resolution to match the iMac’s native setting.
According to How-To Geek, cable quality matters. A cheap, off-brand cable can cause signal problems. Spend a few extra dollars on a good one.
Why You Might Want to Do This
So, why bother? There are some good reasons to use an iMac as a monitor.
It saves you money on a new high-end screen. A good 27-inch monitor costs hundreds of dollars. Your old iMac is basically a free one.
You get a fantastic Retina display for cheap. iMac screens are beautiful and color-accurate. They are great for photo editing or design work.
It’s a smart way to recycle an old computer. Don’t let that perfect glass go to waste. Give your aging iMac a cool second life.
You can create a powerful desktop setup. Hook up your MacBook to the big iMac screen. Now you have portable power and a huge display at home.
It reduces electronic waste. This is a win for the planet. The Environmental Protection Agency promotes reusing electronics. It keeps harmful stuff out of landfills.
I love the simplicity of a single cable. One Thunderbolt connection carries video, data, and power. Your desk stays clean and tidy.
The Big Limitations You Should Know
It’s not all good news. This method has some serious downsides.
The biggest limit is the model year. If your iMac is too new, you’re out of luck. This frustrates a lot of people.
You cannot use an iMac as a monitor for non-Mac devices. No PlayStation, no Xbox, no Windows laptop. The feature is locked to Apple’s ecosystem.
The iMac must be in a powered-on state. It uses a lot more electricity than a regular monitor. You’re running a whole computer just for its screen.
You can’t use the iMac’s own computer parts. Its processor, RAM, and storage sit idle. That feels like a waste of good hardware.
The setup can be glitchy sometimes. It might not work after a MacOS update. Apple doesn’t really support this feature anymore.
You need the original keyboard or a workaround. The Command+F2 shortcut is key. If your iMac’s keyboard is broken, you might be stuck.
What About Newer iMacs? Any Workaround?
People always ask about newer models. They want to use a 2017 or 2020 iMac as a monitor.
The short answer is no. There is no official Target Display Mode for these iMacs. Apple completely removed the hardware feature.
Some third-party software claims to do it. Apps like Luna Display or Duet offer screen sharing. This is not the same as a direct video connection.
These apps send the screen over your network or USB. There is always a small delay, or lag. This is bad for gaming or fast video editing.
The picture quality also takes a hit. It’s compressed to travel over the network. You lose the crisp, perfect image of a direct cable.
According to PC Magazine, software solutions are a compromise. They work for basic tasks like web browsing. For serious work, they often disappoint.
My advice? Don’t buy a new iMac hoping to use it as a monitor. It won’t work. Buy it because you want a great all-in-one computer.
Step-by-Step Guide to Activate Target Display Mode
Let’s walk through the exact steps together. I’ll assume you have a compatible 27-inch iMac from 2011.
Step one: Gather your gear. You need your iMac, a source MacBook, and a Thunderbolt cable. Make sure both machines are plugged in or charged.
Step two: Connect the Thunderbolt cable. Plug one end into your MacBook. Plug the other end into your iMac. Use the correct Thunderbolt port on the iMac.
three: Turn on both computers. Let them boot up to their login screens. Do not log into the iMac. Leave it at the user selection page.
Step four: Press Command+F2 on the iMac’s keyboard. Hold the Command key (⌘) and press the F2 key once. The iMac’s screen should flicker and change.
Step five: You should now see your MacBook’s desktop. It will be stretched across the big 27-inch iMac display. You can now use your MacBook as normal.
Step six: To switch back, press Command+F2 again. This will return the iMac to its own computer mode. You can then log into it normally.
Remember, the iMac’s own system is asleep in this mode. You cannot access its files or run its apps. It is just a screen.
Is This a Good Idea for Gaming or Video?
Maybe, but it has some trade-offs. The iMac screen is gorgeous for media.
The response time is very good with a direct cable. There’s almost no lag, which is great for games. It feels just like using a normal monitor.
The color quality is fantastic for movies and photos. iMac displays are known for being bright and accurate. Watching videos on it is a treat.
But remember, you can only connect another Mac. Most high-end gaming PCs run Windows. You cannot hook a Windows gaming rig to an iMac display.
You also can’t use features like FreeSync or G-Sync. These are gaming technologies for smooth motion. The iMac’s screen doesn’t support them in this mode.
The Sleep Foundation notes bright screens before bed can disrupt sleep. That big, beautiful iMac display is very bright. Use night mode or dim it in the evening.
For casual gaming on a Mac, it’s a great setup. For serious competitive gaming, buy a dedicated gaming monitor. It will have features made for that purpose.
Caring for Your iMac Monitor
If you use your iMac as a monitor daily, take care of it. These screens can last for years.
<pKeep it clean with a soft, dry microfiber cloth. Never spray liquid directly on the glass. Spray the cloth first, then wipe gently.
Turn it off when you’re not using it. Letting it run 24/7 can shorten its life. The backlight and components need rest.
Be mindful of heat buildup. Make sure the vents on the back are clear. Don’t push the iMac right against a wall.
Consider the power usage. An iMac uses more juice than a simple monitor. Unplug it during long vacations to save energy.
The U.S. Department of Energy suggests unplugging idle electronics. It’s a simple way to cut your electric bill. Every little bit helps.
Enjoy your awesome, upcycled display. You’re getting great value from an old machine. That’s a smart tech move.
Frequently Asked Questions
Can an iMac be used as a monitor for a Windows PC?
No, you cannot do this officially. Target Display Mode only works between Macs. There is no way to connect a Windows PC directly.
Can an iMac be used as a monitor for a PlayStation 5?
No, game consoles will not work. The iMac lacks the standard HDMI input that consoles need. You would need a special converter, and even then it’s unlikely to function.
My iMac is from 2015. Can I use it as a monitor?
Unfortunately, no. Apple ended Target Display Mode with the 2014 model year. A 2015 or newer iMac cannot be used as an external monitor in this way.
Can I use the iMac’s speakers when it’s in monitor mode?
Yes, usually. The audio from your source Mac should play through the iMac’s speakers. You might need to select the iMac as the output device in your sound settings.
Can an iMac be used as a monitor wirelessly?
Not for Target Display Mode. That requires a cable. You can use Apple’s AirPlay to mirror a screen wirelessly to a newer iMac, but that’s a different feature with more lag.
How do I know if my iMac can be a monitor?
Check the model year and size. Go to Apple menu > About This Mac. If it’s a 27-inch model from 2009 to mid-2014, it should work. 21.5-inch models only from late 2009 to mid-2010 work.
Conclusion
So, can an iMac be used