HP 621 Notebook PC User Guide - Windows XP - Page 100
Memory modules, To reduce the risk of electric shock and damage to the equipment
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9 Memory modules The computer has one memory module compartment, which is located on the bottom of the computer. The memory capacity of the computer can be upgraded by adding a memory module to the vacant expansion memory module slot or by upgrading the existing memory module in the primary memory module slot. All memory modules installed in the computer must be the same type. When upgrading memory capacity, verify that the upgrade modules are the same type as those already installed in the computer. WARNING! To reduce the risk of electric shock and damage to the equipment, unplug the power cord and remove all batteries before installing a memory module. CAUTION: Electrostatic discharge (ESD) can damage electronic components. Before beginning any procedure, touch a grounded metal object to be sure that you are discharged of static electricity. 88 Chapter 9 Memory modules