Hitachi 8000 Elite manual Installing DIMMs

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will have more memory than the other, the larger amount should be assigned to Channel A. For example, if you are populating the sockets with one 2-GB DIMM, and three 1-GB DIMMs, Channel A should be populated with the 2-GB DIMM and one 1-GB DIMM, and Channel B should be populated with the other two 1-GB DIMMs. With this configuration, 4-GB will run as dual channel and 1-GB will run as single channel.

In any mode, the maximum operational speed is determined by the slowest DIMM in the system.

Installing DIMMs

CAUTION: You must disconnect the power cord and wait approximately 30 seconds for the power to drain before adding or removing memory modules. Regardless of the power-on state, voltage is always supplied to the memory modules as long as the computer is plugged into an active AC outlet. Adding or removing memory modules while voltage is present may cause irreparable damage to the memory modules or system board. If you see an LED light on the system board, voltage is still present.

The memory module sockets have gold-plated metal contacts. When upgrading the memory, it is important to use memory modules with gold-plated metal contacts to prevent corrosion and/or oxidation resulting from having incompatible metals in contact with each other.

Static electricity can damage the electronic components of the computer or optional cards. Before beginning these procedures, ensure that you are discharged of static electricity by briefly touching a grounded metal object. For more information, refer to Appendix D, Electrostatic Discharge

on page 54.

When handling a memory module, be careful not to touch any of the contacts. Doing so may damage the module.

1.Remove/disengage any security devices that prohibit opening the computer.

2.Remove all removable media, such as compact discs or USB flash drives, from the computer.

3.Turn off the computer properly through the operating system, then turn off any external devices.

4.Disconnect the power cord from the power outlet and disconnect any external devices.

CAUTION: You must disconnect the power cord and wait approximately 30 seconds for the power to drain before adding or removing memory modules. Regardless of the power-on state, voltage is always supplied to the memory modules as long as the computer is plugged into an active AC outlet. Adding or removing memory modules while voltage is present may cause irreparable damage to the memory modules or system board. If you see an LED light on the system board, voltage is still present.

5.Remove the access panel.

WARNING! To reduce risk of personal injury from hot surfaces, allow the internal system components to cool before touching.

18 Chapter 2 Hardware Upgrades

ENWW

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Contents Hardware Reference Guide Hardware Reference Guide About This Book Iv About This Book Table of contents Appendix D Electrostatic Discharge Product Features Standard Configuration FeaturesFront Panel Components 1Front Panel ComponentsMedia Card Reader Components 2Media Card Reader ComponentsRear Panel Components 3Rear Panel ComponentsUsing the Windows Logo Key Keyboard4Keyboard Components 5Windows Logo Key FunctionsArrow Serial Number Location 6Serial Number and Product ID LocationHardware Upgrades Serviceability FeaturesUnlocking the Smart Cover Lock Smart Cover FailSafe Key1Removing the Smart Cover Lock Screws Removing the Computer Access Panel Replacing the Computer Access Panel 3Replacing the Computer Access Panel Hardware UpgradesRemoving the Front Bezel Removing Bezel Blanks Replacing the Front Bezel 6Replacing the Front BezelInstalling Additional Memory DIMMsDDR3-SDRAM DIMMs Populating Dimm Sockets 1DIMM Socket LocationsInstalling DIMMs Enww Removing or Installing an Expansion Card 2Expansion Slot Locations11Removing an Expansion Slot Cover Enww Enww Drive Positions 3Drive Positions16Disconnecting the Optical Drive Cables Removing a Drive from a Drive Bay17Disconnecting the Media Card Reader USB Cable Enww Enww Installing Additional Drives Guide Screw DeviceSystem Board Drive Connections 4System Board Drive ConnectionsInstalling a 5.25-inch Drive into an External Drive Bay Enww 27Installing a Hard Drive into the Hard Drive Bay Removing and Replacing a Removable 3.5-inch Sata Hard Drive 30Removing the Thermal Sensor Enww Enww Enww Changing from a Minitower to a Desktop Configuration Enww Changing from a Desktop to a Minitower Configuration Enww Enww Specifications Table A-1SpecificationsPower Output Battery Replacement Type Enww Installing a Security Lock External Security DevicesHP/Kensington MicroSaver Security Cable Lock Padlock HP Business PC Security LockEnww Front Bezel Security Figure C-6Engaging the LockEnww Electrostatic Discharge Preventing Electrostatic DamageGrounding Methods Computer Operating Guidelines and Routine Care Optical Drive Precautions CleaningSafety Shipping PreparationIndex Enww