VoidedWarranty.com has written an article on Static Electricity - Electrostatic Discharge (ESD). In the article they cover ways to help prevent ESD damage to your system:
"Most of the time ESD damage is a silent killer because most people can't feel static discharge until the voltage has reached between 2000 and 4000 VDC. The damage done by static electricity may not show up right away, but over time the damage caused will generate heat causing the damage to spread and eventually that component will fail. We are going to show you a few inexpensive ways to help prevent ESD damage."