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Looking to add a second monitor to your set up? Here's how to do it on Windows and MacOS.
It can also be used on iPhones on iOS 9.3 and up, meaning that you could even do this to turn your old iPhone or iPad into a second monitor for your PC, too.
A dual-monitor set-up can help to increase productivity, but what if your second screen isn't being detected? Here's what to try to fix the problem.