Clean your screen

Over time, your computer screen will become covered with finger prints and dust.

First, you  must turn it off using the Windows Shut down button.  THEN…..

If it is a notebook PC, remove the power plug, remove the battery, then hold the ON switch down for at least 5 seconds.

If it is a desktop type screen, remove the power plug from it

Now take a piece of cloth that is used for cleaning eyeglasses.  Dampen it (not wet) with eye glass cleaning fluid.  Wipe very gently and slowly. The screen is covered with a very soft plastic that is very easily scratched.  Once it is scratched, you cannot fix it.