HP dx2480 manual To permit required airflow

Page 74

Troubleshooting

Problem	Cause	Solution
Computer will not respond	Computer is in standby	Press the power button to
to USB keyboard or mouse.	mode.	resume from standby mode.

USB Keyboard does not	Keyboard or mouse is not	Connect keyboard and
respond/work	connected to computer.	mouse cables to computer.

	System has locked up.	Restart the computer.

System USB Keyboard support is not enabled in the F10 BIOS setup.

Restart the computer and press F10 to enter BIOS setup. Enter into Integrated peripherals and enable the USB keyboard support.

CAUTION: When attempting to resume from standby mode, do not hold down the power button for more than four seconds. Otherwise, the computer will shut down and you will lose any unsaved data.

Computer date and time display is incorrect.

RTC (real-time clock) battery may need to be replaced. .

MConnecting the computer to a live AC outlet prolongs the life of the RTC battery.

First, reset the Date and Time Properties in the Control Panel (Computer Setup can also be used to update the RTC date and time). If the problem persists, replace the RTC battery. See the Hardware Reference Guide on the Documentation and Diagnostics CD for instructions on installing a new battery.

on.

Cursor will not move using the The Num Lock key may be arrow keys on the keypad.

Press the Num Lock key. The Num Lock light should not be on if you want to use the arrow keys. The Num Lock key can be disabled (or enabled) in Computer Setup.

Poor performance is	Processor is hot.	1. Ensure airflow to the
experienced.		computer is not blocked.
		Leave a 4-inch (10.2-cm)
		clearance on all vented sides
		of the computer and monitor
		to permit required airflow.
		2. Ensure fans are connected
		and working properly (some
		fans only operate when
		needed).
		3. Ensure the processor heatsink
		is installed properly.

Troubleshooting Guide

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Contents Hardware Reference Manual Hardware Reference Guide Hardware Reference Guide Contents Security Lock Provisions Product Features Standard Configuration FeaturesFront Panel Components Front Panel ComponentsRear Panel Components Rear Panel ComponentsKeyboard Keyboard ComponentsWindows Logo Key Special Mouse FunctionsSerial Number Location Hardware Upgrades Serviceability FeaturesRemoving the Computer Access Panel Removing the Front Bezel DDR2-SDRAM DIMMs Installing Additional MemoryDIMMs Populating Dimm Sockets Installing DIMMs Installing a Dimm Removing a 5.25 Drive Bezel Blank Replacing or Upgrading a Drive Locating Drive Positions Drive PositionsRemoving a Drive Hard disk is inserted or slide out from the back Replacing a Drive Sliding the Drives into the Drive Cage Sliding the Hard Drive into the Drive Cage Install Second Hard Disk Hardware Upgrades Hardware Upgrades Removing or Installing an Expansion Card Releasing the Slot Cover Lock Removing an Expansion Slot Cover Removing an Expansion Card Replacing or Adding an Expansion Card Securing the Expansion Cards and Slot Covers Reassembling the Computer Turn on the computer by pressing the power button Battery Replacement Hardware Reference Guide Power Supply Notice Power Supply Label Mechanical Lock Installing a Security LockChassis Intrusion Switch Preventing Electrostatic Damage Grounding MethodsHardware Reference Guide Computer Operating Guidelines and Routine Care Safety Optical Drive PrecautionsCleaning OperationShipping Preparation Computer Setup F10 Utility Guide Computer Setup F10 Utility Guide Contents Contents Computer Setup F10 Utility Computer Setup F10 UtilitiesUsing Computer Setup F10 Utilities Computer Setup F10 Utility Computer Setup Heading Option DescriptionCHS 1MB 3BC/IRQ7 Computer Setup Heading Option Description Troubleshooting Guide Troubleshooting Guide Computer Diagnostic Features HP Insight DiagnosticsAccessing HP Insight Diagnostics Survey Tab Test Tab UnattendedStatus Tab Saving and Printing Information in HP Insight Diagnostics Log TabDownloading the Latest Version of HP Insight Diagnostics Troubleshooting Safety and Comfort Before You Call for Technical SupportTroubleshooting Run the Restore Plus! DVD Helpful HintsTroubleshooting Solving General Problems Problem Cause SolutionTo permit required airflow Cable connections are Problem Cause Solution Solving Hardware Installation Problems Interpreting Diagnostic Lights and Audible Codes Problem CauseDiagnostic Front Panel LEDs and Audible Codes Diagnostic Front Panel LEDs and Audible Codes Restoring the Software Contacting Customer Support