HP m9500f Upgrading and Servicing Guide - Page 6

Preparing the computer Before you upgrade any component in your computer, you must prepare it so that you can safely handle it and the components. Read the following items before attempting to upgrade or service the computer: 1 These procedures assume familiarity with the general terminology associated with personal computers, and with the safety practices and regulatory compliance required for using and modifying electronic equipment. 2 Write down and save the system model and serial numbers, all installed options, and other information about the system. It is easier to consult this information than to open and examine the computer. 3 It is recommended that you use an antistatic wrist strap and a conductive foam pad when working on the system. WARNING: Before you remove the front and side panels of the computer, always disconnect the modem cord from the telephone system, and then disconnect the computer from the power source. Failure to do so can result in personal injury or equipment damage. Before opening the computer To avoid injury and equipment damage, always complete the following steps in this order before opening the computer: 1 Remove any optical disc (CD or DVD) from the computer. 2 Shut down the computer. 3 Disconnect the modem/telephone cable, if present. CAUTION: To reduce the risk of personal injury from electrical shock or hot surfaces, disconnect the power cord from the wall outlet, and allow the internal system components to cool before touching them. 4 Disconnect the power cord from the electrical outlet, and then from the computer. 5 Disconnect all other attached cables (such as the keyboard, mouse, and monitor cables). 6 Disconnect all external devices. CAUTION: Static electricity can damage the electronic components of the computer or optional equipment. Ensure that you are discharged of static electricity by briefly touching a grounded metal object. 2 Upgrading and Servicing Guide