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There is a few step to check if the problem occur.

1. Check the cable connection. Make sure it place well.
2. Unplugging monitor and re-plugging back monitor cable (VGA / HDMI / Display Port).
3. Change the monitor cable (if still got shadow after Step 2).
4. Try to change another monitor (if Step 2 & Step 3 didn't work)

 
 

Keywords: shadow display