My Dell Inspirion 14 N4050 met this error. It apper a blank on the top of screen like in the image and can not be full display. In the beginning, the laptop is normal and does not have any problem. But when I standby laptop or run program that appear the caution of UAC in window. It appear and I have to log off or restart to become normal again. So what error I meet? And how to fix this problem?
