My guess is there was some update that failed or a wonky video driver that is causing you trouble. First thing to always try with any Windows 10 issue is update. Since Microsoft moved to a service model, updates are coming out all the time. Click Start, then the gear, then update and security. Click check for updates and install whatever comes up. If that doesn't help, from that settings window type "display" in the search box. Check your Scale and layout settings. Set them to the recommended settings. Also make sure you don't have multiple monitors set (unless you actually do). If that doesnt help, from that same display settings window, click Display adapter properties. On the adapter tab, click properties, then click on the driver tab. Click to update your driver and have it search for a new display adapter driver. If none of these work. I would suggest either doing a system restore or resetting your pc. HTH David Sent from my SM-N920V using Tapatalk