Hi Maree,
Shaking screen and blurry display are usually caused by an app or display driver. To find out whether an app or driver is causing the issue, see if the Task Manager flickers.
Open Task Manager by pressing the Ctrl + Shift + Esc keys on the keyboard at the same time. If that doesn't work, right-click the Start button in the lower-left corner of your screen and then select Task Manager.
- If Task Manager doesn't flicker, an app is probably causing the problem.
- If Task Manager does flicker, a display driver is probably causing the problem.
Three apps were previously known to cause screen flickering in Windows 10: Norton AV, iCloud, and IDT Audio. In most cases, updating the app or contacting the app manufacturer for an update will resolve the issue.
Try to uninstall Duet Display.
Go to Start , and select Settings > System > Apps & Features, and check to see if Duet Display is listed under installed software. If Duet Display is in the apps list, uninstall it.
To update your display driver, you'll need to start your PC in safe mode, uninstall your current display adapter, and then check for driver updates.
- Start your PC in safe mode, then right-click the Start button and select Device Manager.
- Expand the Display adapters section, right-click the listed adapter, then select Uninstall device. Select the Delete the driver software for this device check box, then select Uninstall and restart your device.
- After your device restarts, press the Windows key + I on your keyboard to open Settings. If that doesn't work, select the Start button and then select Settings.
- From Settings, select Update & security > Windows Update > Check for updates.
Let us know if you need further assistance.