HP 18XL381 manual Rebooting After a Lockup

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Presario 1800/1800T Series

Models: XL280, XL380, XL381,

and XL390

Rebooting After a Lockup

To reboot the Notebook when the keyboard is frozen or the screen is locked, press and hold down the Power ª button for at least four seconds; this causes the Notebook to shutdown. Then, restart the Notebook with a single press of the Power ª button.

If the Notebook still does not recover, press the Power ª button and hold for four seconds to shut it down, then remove the battery and unplug the AC power for at least 30 seconds. Reinsert the battery or reconnect AC power and press the Power ª button once to reboot.

Recovering From a Loss of Electrical Power

Loss of electrical power causes the Notebook to turn off automatically. This may cause loss of data because the Microsoft Windows operating system is not able to close all files and programs properly.

Loss of power may be caused by one of the following:

Electrical power service is interrupted.

The power cord is accidentally disconnected.

If power surges or sags, the display and status lights may flicker, and the Notebook may automatically restart. If an improper shutdown occurs, the Microsoft Windows utility program, ScanDisk, runs automatically once power is restored. ScanDisk determines whether the improper shutdown caused any errors on the hard disk. These errors may occur if the Microsoft Windows operating system is not able to close all files properly before the shutdown. If no errors are found, the restart process continues. If ScanDisk does detect errors, follow the instructions on the screen to continue the restart process. Work that was not saved before the loss of power or shutdown may be lost.

If a power failure occurs, or the power cord disconnects while the Notebook is turned on, turn it off until normal service is restored. The next time the Notebook is turned on, ScanDisk may run to check the hard disk for errors caused by improper shutdown.

PRESARIO NOTEBOOK MAINTENANCE AND SERVICE GUIDE 1800 SERIES

BATTERY AND POWER MANAGEMENT 5

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Contents Welcome to the Maintenance & Service Guide MSG Using this Guide Before You Begin Preface Serial Number Product Description Processor BatteryFeatures XL381 XL390 Display Hard DriveFront of Unit # Description # Description# Description DescriptionModel XL3xx Front Bezel Components Left-Side Components Right-Side Components Underneath the Unit Rear Connectors Optional QuikDock Specifications Specification MetricSystem Interrupts Hardware System FunctionAddress System Function Shipping Configuration System I/O AddressesPresario 1800/1800T Series Memory Address System Function System Expansion Total Memory Board Memory MemorySpecificationValue DisplaySpecification 10.0 GB 12.0 GB Specification 15.0 GB 20.0 GB 32.0 GBSpecification AHr Li-ion SpecificationPin Signal Pin AssignmentsTV-Out Composite Video Connector Modem Connector Game Port Connector QuikDock Connector Battery and Power Management Activation Standby Mode Hibernation Mode Off Mode AutomaticIndicators ManualBattery Power Power Scheme Always On AC PowerPortable Home Laptop Office Desk Default Alarm Settings Setting Low Battery Critical BatteryRebooting After a Lockup Increasing Battery Pack Operating Time Conditioning a Battery Pack Li-ion Enhanced Charge Time Battery PackTroubleshooting Preliminary Steps Clearing the Power-On Password System Board Failure Probable Cause Recommended Action Post Error MessagesSystem Options Not Set Probable Cause Keyboard or System Unit Error Probable Cause XX000YZZ 201-Memory Error Probable CauseKeyboard Error Recommended Action Diskette Controller Error Probable CausePrimary Hard Drive 0 Failure Probable Cause Hard Drive Controller Probable CauseCheckup Test View System Information Inspect Diagnostic Error Codes Error Code Description Recommended Action Processor Test Error CodesMemory Test Error Codes Keyboard Test Error Codes Serial Test Error Codes Hard Drive Test Error Codes Description Recommended Action Video Test Error Codes Presario 1800/1800T Series Audio Test Error Codes Presario 1800/1800T Series Troubleshooting without Diagnostics Before Replacing PartsBattery Pack/Gauge Solutions Solving Minor ProblemsAudio Solutions Audio Problem Probable Cause SolutionReplace the battery pack Replace the RTC battery Presario 1800/1800T Series CD or DVD Drive Problem Probable Cause Solutions CD and DVD Drive SolutionsDiskette Drive Solutions Diskette Drive Problem Probable Cause SolutionsDisplay Problem Probable Cause Solutions Display SolutionsUsing Fn+F7 or Fn+F8 Replace the display assembly Replace the system board Backlight brightness cannot be adjusted with Fn+F7 or Fn+F8 Hard Drive Problem Probable Cause Solutions Hard Drive SolutionsHardware Installation Solutions Hardware Installation Problem Probable Cause SolutionsKeyboard/Numeric Keypad Problem Probable Cause Solutions Keyboard/Numeric Keypad SolutionsMemory Solutions Memory Problem Probable Cause SolutionsPC Card Problem Probable Cause Solutions PC Card SolutionsPC Card sound effects PC card modem or fax card does not work Power Solutions Power Problem Probable Cause SolutionsPrinter Solutions Printer Problem Probable Cause SolutionsTouchPad/Pointing Device Solutions TouchPad/Pointing Device Problem Probable Cause SolutionsContacting Compaq Support Shipping PreparationRemoval & Replacement Required Tools ZIF Connector Cables Hard Drive Ribbon Cable Diskette Drive Ribbon Cable Keyboard Ribbon CableCD/DVD Ribbon Cable Diskette Drive Ribbon Cable CD/DVD Ribbon Cable Keyboard Ribbon CableSpeaker Assembly Cable CD/DVD Ribbon Cable Speaker Assembly Cable Keyboard Ribbon CablePreparing the Notebook for Disassembly Removal Procedures QuikDockBattery Pack Palmrest Cover with TouchPad Presario 1800/1800T Series Presario 1800/1800T Series Keyboard Button Board Cover Presario 1800/1800T Series Presario 1800/1800T Series Presario 1800/1800T Series Internet Switch Board Presario 1800/1800T Series Heat Sink Heatspreader Modem Hard Drive Disconnect the hard drive data cablePresario 1800/1800T Series Presario 1800/1800T Series LCD DisqPlay Module Processor Presario 1800/1800T Series CD, CD-RW, or DVD Drive Presario 1800/1800T Series Presario 1800/1800T Series Display Panel Assembly Presario 1800/1800T Series Presario 1800/1800T Series Upper CPU Cover Fan Assembly Presario 1800/1800T Series Real Time Clock RTC Battery Presario 1800/1800T Series Diskette Drive Presario 1800/1800T Series Voltage Converter Board Speaker Assembly Presario 1800/1800T Series System Board Presario 1800/1800T Series Presario 1800/1800T Series Presario 1800/1800T Series To replace the system board, reverse these procedures Memory Module Presario 1800/1800T Series Parts Catalog Spare Part ItemsBoards Display Assembly Spare Part ItemMass-Storage Devices Miscellaneous Cable Kit Miscellaneous Plastics Kit Miscellaneous Parts Part Numbers & Availability Alphabetical Spares Listing Disqplay Module, See LCD Indicator Module SO Dimm 171815-001 All 170835-004 All US platforms 191298-003
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