Second monitor not detected after Sleep on Windows PC If the second monitor is not detected after sleep, first of all, check the cable connecting your second monitor to your system.

How to turn an old tablet into a second PC monitor for free Put your spare screens to work with this free software.

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.

Sidecar in macOS turns your iPad into a second display, but it's limited to certain Macs and iPads. Thankfully, a few third-party apps can help if you have an older Apple device or Windows PC.