HP DL785 Error Prevention Guide - Page 8

• Be sure the server does not share a power line with high-current machines, such as laser printers, air conditioners, copiers, and coffee machines, or ungrounded power strips. • Periodically check AC grounded (earthed) outlets to see if they are in need of repair. • Take the system cover off, and then remove any dust buildup with a can of compressed air, tighten any loose connections, reseat boards, and inspect any cables for frays. Move the cables away from sources of heat and give them more slack if possible. CAUTION: To avoid potential problems, always read the cautionary information in the server documentation before removing, replacing, reseating, or modifying system components. • Check for adequate airflow and dislodge anything blocking the fans. • Check for dust on external server parts, such as fans. • Check the server after power disruptions due to acts of nature. Refer to the "Recognizing Power Problems Caused by Acts of Nature" section in this guide. Recognizing Power Problems Caused by Acts of Nature Some power problems are caused by acts of nature, which can range from lightning and excessive heat to ice, rain, and windstorms. Lightning can cause spikes and surges (a spike is a quick impulse of undesirable high voltage on a power line, typically lasting only a fraction of a second, whereas a surge is a sudden increase in line voltage of short duration). Excessive heat from increased use of air conditioners can overload utility grids, causing erratic voltages, brownouts, or power outages (brownouts are voltage reductions by a utility company to counter excessive demand on its generation and distribution system). Storms can cause total blackout conditions due to downed power lines. Error Prevention Guide 9