Keyboard A dirty keyboard can cause keys to stick or prevent keys from being depressed properly, leading to command errors. Monitors An accumulation of dust on the monitor may cause the discharge of static electricity, which may in turn cause data errors or, in extreme cases, equipment failure. Reading through a dirty monitor may also cause eye fatigue, eye strain or headaches. Diskette Storage Magnetic storage media needs maintenance attention. Excessive heat can warp a tape.
Excessive humidity can deteriorate the chemicals used on the media surface.
Even clean skin contains body oils that attract contaminants that can cause problems. Magnetic fields can erase or obscure the data on the tape. Other sources of magnetic fields include electric motors, transformers, power lines, telephones, and televisions. A computer virus is an executable computer program which can copy itself. The program, when it runs, will initiate some kind of event on the infected computer.