Yes, you can use an iMac as a monitor, but only with specific Mac models. This feature is called Target Display Mode, and it turns your iMac into a great external screen for another computer.
It’s a common question for folks who want a bigger screen. Maybe you have an old iMac and a new laptop. You might want to use the iMac’s beautiful display for your other work.
I’ve tested this setup myself with different Macs. The rules can be a bit tricky, so I’ll walk you through them. It’s not as simple as just plugging in a cable.
This guide will show you exactly how to do it. I’ll cover which iMacs work, what you need, and the steps to make it happen.
What is Target Display Mode?
Target Display Mode is Apple’s special feature. It lets an iMac act as a monitor for another device. Think of it like turning your all-in-one computer into just a screen.
The iMac’s brain goes to sleep in this mode. Its powerful processor and memory take a nap. Only the beautiful display stays awake and ready to work.
You connect another Mac to the iMac with a cable. The i then shows whatever is on the other computer. It’s a smart way to reuse an older machine.
This feature was built for creative pros at first. They wanted to use their iMac’s great color with a MacBook. Now, many people use it to extend their workspace.
It’s important to know this mode has limits. Not every iMac can do it, and not every Mac can connect to it. The compatibility list is specific, which we’ll cover next.
When it works, it’s a fantastic setup. The iMac’s screen quality is often better than cheap monitors. You get accurate colors and sharp text for your other computer.
Which iMac Models Can Be Used as a Monitor?
You can only use certain iMac models as a monitor. Apple made this feature for a limited range of years. The first iMacs with Target Display Mode came out in 2009.
Late 2009 to Mid 2014 iMacs work with this feature. These are the 21.5-inch and 27-inch models from those years. The 27-inch screens are more popular for this use because they’re bigger.
I have a 2011 27-inch iMac that I use this way. It works perfectly with my MacBook Pro. The large screen makes editing photos much easier.
iMacs from 2015 and newer cannot be used as monitors. Apple removed the Target Display Mode feature from these models. This is a key point many people miss.
Always check your iMac’s model year first. You can find this under the Apple menu in “About This Mac.” Look for the year next to the model name.
If your iMac is too old or too new, it won’t work. The sweet spot is really those 2009-2014 models. They make excellent secondary displays when set up right.
What Computers Can Connect to the iMac?
Not every computer can connect to an iMac in monitor mode. The source computer needs to be a specific Mac model too. You can’t just plug in a Windows PC or a game console.
The iMac acting as a monitor needs another Mac as its source. This Mac must have a Mini DisplayPort or Thunderbolt port. These are the small rectangular ports on the side of older Macs.
MacBooks, Mac Minis, and Mac Pros from around 2009-2014 work well. They need to be running macOS that supports Target Display Mode. According to Apple’s support site, the software version matters too.
I tried connecting a 2020 MacBook Air to my 2011 iMac. It didn’t work because the ports and software don’t match up. The technology changed too much between those years.
You basically need two Macs from the same era. Think of them as brothers from the same technology generation. They speak the same display language through their ports.
This limitation frustrates many people. They buy cables hoping to connect modern devices. But the truth is, you need compatible vintage Apple hardware for this trick.
How to Set Up Target Display Mode
Setting up Target Display Mode takes a few simple steps. First, make sure both your Macs are turned on and awake. They should be sitting near each other on your desk.
Connect the two Macs with the right cable. You need a Mini DisplayPort or Thunderbolt cable, depending on your models. The cable goes from the source Mac to the iMac you’re using as a monitor.
On the iMac that will become the monitor, press Command-F2. Hold the Command key and tap the F2 key at the same time. The screen should flash and then show the other Mac’s display.
If Command-F2 doesn’t work, try the brightness key instead. Some iMac models use F1 or other function keys. Check your iMac’s manual for the exact key combination.
You’ll know it worked when the iMac’s screen changes. It will stop showing its own desktop and show the other computer’s screen instead. The iMac’s keyboard and mouse won’t control anything in this mode.
To exit Target Display Mode, press Command-F2 again. Or you can just disconnect the cable between the two computers. The iMac will return to being a normal computer.
Cables and Connections You Need
The right cable makes all the difference in this setup. Using the wrong cable is the most common mistake people make. I’ve bought the wrong cable myself, so learn from my error.
For 2009-2010 iMacs, you need a Mini DisplayPort cable. This cable has the same connector on both ends. It looks like a small rectangle with rounded corners.
For 2011-2014 iMacs, you need a Thunderbolt cable. Thunderbolt cables look similar to Mini DisplayPort cables. But they have a lightning bolt symbol on the connector.
Thunderbolt cables are more expensive than Mini DisplayPort cables. They transfer data faster, which matters for video signals. Don’t try to use a cheap HDMI cable instead – it won’t work.
Make sure your cable is long enough for your setup. Measure the distance between where the two computers will sit. Add a little extra length for comfortable cable management.
According to TechSoup, using quality cables prevents signal problems. A bad cable can cause flickering or no signal at all. Invest in a good cable from a trusted brand.
Keep your cable somewhere safe when not in use. These specific cables can be hard to find as they get older. Having a spare isn’t a bad idea if you use this setup daily.
Common Problems and Solutions
Many people run into issues when trying to use an iMac as a monitor. The screen stays black, or the Command-F2 shortcut does nothing. Let’s fix these common problems.
First, check your iMac model year again. If it’s from 2015 or newer, it simply won’t work. No amount of cable swapping or key pressing will change this hardware limit.
Make sure both Macs are powered on and awake. The iMac can’t enter Target Display Mode from sleep or shutdown. Start with both computers at their login screens.
Try a different cable if you have one available. Cables can fail even if they look fine. Borrow a friend’s cable to test if yours is the problem.
Update the software on both Macs. Older macOS versions might have bugs with Target Display Mode. The Apple website has updates for older systems.
Reset the NVRAM on both computers. Shut down the Macs, then turn them on while holding Command-Option-P-R. Keep holding until you hear the startup sound twice.
If nothing works, the feature might be broken on your iMac. Hardware failures can disable Target Display Mode. In that case, you’ll need to use the iMac as a regular computer.
Benefits of Using an iMac as a Monitor
Using an iMac as a monitor has some great benefits. The screen quality is the biggest advantage in my opinion. iMac displays have accurate colors and high resolutions.
You save money compared to buying a new high-end monitor. A good 27-inch monitor can cost hundreds of dollars. Your old iMac might already be sitting in a closet somewhere.
It reduces electronic waste by reusing old technology. Instead of throwing away a perfectly good iMac, you give it new life. The Environmental Protection Agency encourages reusing electronics.
The all-in-one design saves desk space. You don’t need a separate monitor stand or base. The iMac’s elegant stand holds everything in one clean package.
You get built-in speakers, camera, and USB ports. The iMac’s webcam works for video calls from your connected Mac. The speakers provide decent sound without extra clutter.
It’s a temporary setup that’s easy to undo. When you’re done using it as a monitor, just disconnect the cable. The iMac goes back to being a full computer instantly.
Limitations and Drawbacks
This setup has some real limitations you should know about. The compatibility window is very narrow, as we discussed. Only specific iMacs from specific years work.
You can’t use the iMac’s computer parts while in monitor mode. The processor, memory, and storage are inactive. The iMac becomes just a screen with speakers.
The iMac’s keyboard and mouse don’t control the connected Mac. You need separate input devices for the source computer. This means two keyboards and mice on your desk.
Screen resolution might not match perfectly. Some Macs force the iMac to use non-native resolutions. Text can look blurry if the scaling isn’t right.
According to Digital Trends, input lag can be noticeable for gaming. The video signal takes a tiny moment to pass through the cable. Competitive gamers might find this delay annoying.
The iMac generates heat and uses power even as just a monitor. It’s less efficient than a dedicated monitor designed for low energy use. Your electricity bill might be slightly higher.
Alternative Options to Consider
If you can’t use your iMac as a monitor, don’t worry. Several alternative options might work better for your situation. Let’s look at what else you can try.
Use screen sharing software between two Macs. Applications like Luna Display create a wireless connection. You see one Mac’s screen on the other, though with some lag.
Buy a dedicated monitor for your computer. Monitor prices have dropped a lot in recent years. You can find good 27-inch screens for reasonable prices now.
Use your iPad as a second screen with Sidecar. This Apple feature works with newer Macs and iPads. It turns your tablet into a wireless portable monitor.
Keep using your iMac as its own computer. Set it up next to your main computer for separate tasks. You can research on one while writing on the other.
Sell or trade in your old iMac toward a new monitor. Apple and other companies offer recycling programs. You might get credit toward a display that actually works with your current computer.
The Consumer Reports website has good monitor buying guides. They test screens for color accuracy, brightness, and value. This helps you find the right display for your needs.
Frequently Asked Questions
Can I use iMac as a monitor for a Windows PC?
No, you cannot use an iMac as a monitor for a Windows PC. Target Display Mode only works between two specific Mac computers. The feature doesn’t recognize Windows machines at all.
Can I use iMac as a monitor for a gaming console?
No, gaming consoles like PlayStation or Xbox won’t work either. These devices output different video signals than what the iMac expects. You need a regular monitor or TV for consoles.
Can I use a 2017 iMac as a monitor?
No, 2017 iMacs cannot be used as monitors. Apple removed Target Display Mode after the 2014 models. Newer iMacs don’t have this capability at all.
Can I use iMac as a monitor wirelessly?
Not with Target Display Mode, which requires a cable. But you can use screen sharing apps for a wireless connection. These apps create more lag than a direct cable.
Can I use the iMac as a monitor and computer at the same time?
No, when the iMac is in Target Display Mode, its computer parts are inactive. It works only as a display. You can’t run apps on it while using it as a monitor.
Can I use iMac as a monitor for a MacBook Pro?
Yes, if both devices are compatible. A 2011-2014 iMac can work as a monitor for a 2011-2014 MacBook Pro. They need the right cable and software versions.
Conclusion
So, can I use iMac as a monitor? Yes, but with important conditions. You need the right iMac model from 2009 to 2014. You also need another compatible Mac as the source computer.
Target Display Mode is a clever feature when it works. It turns a beautiful iMac screen into an external display. This saves money and reduces waste from old electronics.
Check your iMac’s model year before buying any cables. Make sure your other Mac is compatible too. Follow the setup steps carefully for the best results.
If your iMac is too new or too old, consider other options. Screen sharing apps or a new monitor might work better. The goal is extending your workspace in a way that fits your needs.
I hope this guide helped answer your questions. Trying to use an iMac as a monitor can be confusing. Now you have the facts to make the right choice for your setup.