Dust is removed by use of portable vacuum cleaner, or little brush which has an air pump attachment. Screen burnout is a term used to describe damage caused to the inside surface of the screen display. The inner surface of the screen is coated in a phosphorous material that emits light when struck by an electron beam. This might take several days or weeks to occur. Damage to the screen cannot be repaired.
Damage is visible by turning of the display, and inspecting the screen surface closely.
Screen burnout is avoided by following common sense principles. Most screen saver programs provide a choice of screen images to display, as well as adjusting the amount of idle time necessary before changing the screen display. When a key is pressed, the screen saver program restores the original screen display. An energy star compliant monitor will switch itself off into low power states when the input signal does not change for a determined time interval. Some modern operating systems like Windows 95 support this mode of operation.