HP Pavilion dv4-2100 Notebook PC User Guide - Windows 7 - Page 25
Bottom components, Help and Support.
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Bottom components Component (1) Hard drive bay (2) SmartBay release latch (3) Memory module compartment (4) Mini Card compartment (5) Battery release latch (6) SIM slot (select models only) (7) Battery bay (8) Vents (3) Description Holds the hard drive and the wireless LAN (WLAN) module. CAUTION: To prevent an unresponsive system, replace the wireless module only with a wireless module authorized for use in the computer by the governmental agency that regulates wireless devices in your country or region. If you replace the module and then receive a warning message, remove the module to restore computer functionality, and then contact technical support through Help and Support. Releases the SmartBay module. Contains the 2 memory module slots. Holds the RTC battery and, on select models, holds a wireless WAN (WWAN) module or a TV tuner card. CAUTION: To prevent an unresponsive system, replace the wireless module only with a wireless module authorized for use in the computer by the governmental agency that regulates wireless devices in your country or region. If you replace the module and then receive a warning message, remove the module to restore computer functionality, and then contact technical support through Help and Support. Releases the battery from the battery bay. Contains a subscriber identity module (SIM). The SIM slot is located inside the battery bay. Holds the battery. Enable airflow to cool internal components. NOTE: The computer fan starts up automatically to cool internal components and prevent overheating. It is normal for the internal fan to cycle on and off during routine operation. Components 13