Layers of dust act as heavy insulation on tiny microchips, causing overheating. Give your system plenty of breathing room. Confined space causes damaging overheating in PC's, printers, and other components. Don't smoke around your system. To better understand this problem, try to clean a smoker's inside car windows.
Many monitors are heavy enough to bend the top of PC's and damage internal parts.
Use a surge protector, uninterruptible power supply, or a power conditioning unit to give your computers, printers, and other critical components the good power they need. Look for models that guarantee to pay for damages to your system, caused by power, while connected to their device. When you see or feel static, you have about ten times more static than your computers can handle. Monthly, run disk diagnostic and tuning utilities , like Norton Utilities, Windows 95 System Tools, or MS-DOS 6 utilities to check the hard disks' health. Defrag your disk periodically for optimum disk performance.