Windows 10 stores the settings for all previously connected projectors and monitors including layout and snapshots of each combination. There are some cases where this information can become corrupted and cause your visual system to break with one or more projectors showing no signal for no apparent reason. This can happen after a power loss, or when the PC or projectors are not shut down correctly.
To solve this issue, we are going to clear the old information from the Windows registry, causing Windows to rebuild the data.
You may have to start by unplugging all projectors, then plugging in just one. Try each projector one at a time until you can get one working. Otherwise, you may need to find an LCD monitor and try plugging that in.
Once you have at least one display working, and only one plugged in. We can start the process of deleting the old data.
- Open the start menu and type regedit
- Navigate through the folders to the following location
- There are three folders we need to delete Configuration, Connectivity, and ScaleFactors.
Right-click on each one and click Delete.
- Re-start Windows 10.
- Once Windows has booted, plug in all of your projectors as they were previously.
- Now you can set up the projectors in Windows Display Manager, and also re-configure desktop spanning if required.