HP 240 HP 450 Notebook PC and HP 455 Notebook PC Maintenance and Service Guide - Page 107
System board see - drivers
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3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet and then unplugging the AC adapter from the computer. 4. Remove the battery (see Battery on page 41), and then remove the following components: ● WLAN module (see WLAN module on page 49) ● Hard drive (see Hard drive on page 54) ● Keyboard (see Keyboard on page 60) ● Top cover (see Top cover on page 63) ● Speakers (see Speakers on page 71) ● USB board (see USB board on page 73) ● Power connector cable (see Power connector cable on page 75) ● Display assembly (see Display assembly on page 77) ● System board (see System board on page 86) ● Fan/heat sink assembly (see Fan/heat sink assembly on page 92) To remove the processor: 1. Use a flat-bladed screw driver (1) to turn the processor locking screw one-half turn counterclockwise (2) until you hear a click. Component replacement procedures 99