Try Windows Key + CTRL+Shift+B.
This restarts the graphic driver and can cure some issues.

Anglesey Computer Solutions / Atebion Cyfrifiaduron Môn
help@angleseycomputersolutions.co.uk / 07899 944695 / 01407 721439
Try Windows Key + CTRL+Shift+B.
This restarts the graphic driver and can cure some issues.