If part of your computer monitor’s screen is not refreshing properly and shows old content, when you refresh the screen, see ...

Skip the paper towels: Random fabrics and disposable cloths can scratch the surface or leave behind lint and fibers. Instead, ...

How to keep your computer screen clean: If you use a laptop, try to always cover its keyboard with a thin microfiber cloth before closing it. ... Unplug the keyboard and place it on the towel.

If the no signal message also has vertical lines, you know the problem is in the monitor and not in your computer. Press the "Menu" button on the screen and then use the other buttons to browse ...