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HP PCs - Troubleshooting Sleep and Hibernate issues (Windows Vista)

This document pertains to HP computers with Windows Vista.
The Sleep and Hibernate modes are power-saving states that greatly reduce the energy use of your PC while it is in use. The Sleep mode keeps your work and settings in memory, cutting energy use significantly, but allows you to return your PC to normal operation quickly.
Hibernate mode is a power-saving feature designed primarily for notebooks. While Sleep mode temporarily suspends your work and settings, drawing a small amount of power, Hibernate mode saves open documents and programs to the hard disk, and then powers down your PC. As Hibernate mode uses virtually no energy, it is the best option for conserving the battery power of your notebook.
When the Sleep and Hibernate functions are working properly, there are a number of ways, both manual and automatic, to make your PC Sleep or Hibernate. You can also customize how your computer enters each mode, or set up the computer so that it uses one mode exclusively.
Use the procedures in this document to resolve common issues with the Sleep and Hibernate modes.
The computer does not wake from Sleep or Hibernate mode
Restarting your computer erases all information in the computer's memory, which may restore functionality. Before performing the following tasks be sure to restart your computer to attempt to resolve the issue:
If you have a notebook computer that cannot return from Sleep mode, first make sure it is connected to an AC power source and the power light is on.
Sleep or Hibernate issues on notebook computers can be caused by external devices connected to the notebook by USB drives. An external mouse or an external keyboard connected by USB may not be configured to wake a notebook from Sleep or Hibernate modes.
The following sections explain how to check the keyboard and mouse settings, allow an external keyboard or mouse to wake the computer, and Wake-on-LAN:
The computer wakes from Sleep or Hibernate mode unexpectedly
Interruptions to Sleep or Hibernate modes are often caused by software and external devices. The following sections describe how to check external devices, screen savers, and programs that may be responsible for waking the computer:
Testing and configuring Sleep and Hibernate modes
There are a number of different ways to configure how the Sleep and Hibernate modes are implemented in the computer. Being aware of how the Sleep and Hibernate modes are configured on your PC can help you avoid later issues.
If your PC has a keyboard with Sleep and Power buttons, you can configure those to make the computer Sleep or Hibernate. A notebook PC can be configured to Sleep when the display panel lid is closed. If you still experience problems with Sleep and Hibernate modes, continue to the next section.
To verify that Sleep and Hibernate can be activated manually, test them from the Shut down menu.
Using System Restore to resolve problems with Sleep or Hibernate mode
If Sleep or Hibernate mode previously worked but now is causing problems or does not work, use System Restore to revert the computer back to a time when those modes worked. If the problem has always existed, skip this section.
To perform a System Restore:
  1. Save any open files and close all programs. Backup any important files.
  2. Click Start, enter restore in the search field, and then select System Restore from the search result list.
  3. Select Choose a different restore point, and then click Next.
  4. Select a date from the list when Sleep or Hibernate mode worked correctly, and then click Next.
  5. Confirm the restore point, and then click Finish.
  6. Click Yes in the confirmation message that opens.
  7. The computer should shut down and turn back on automatically after the restoration completes.
  8. After the computer restarts, put it into Sleep or Hibernate mode to see if the problem still exists.
    • If after performing a System Restore the computer can enter Sleep or Hibernate mode, the problem is probably caused by software that was installed after the restore point date. Install the latest drivers and software one at a time and test the Sleep and Hibernate functions.
    • If the problem still exists, see the next section.
Updating the BIOS to resolve problems with Sleep or Hibernate mode
The BIOS controls every physical component in a computer at a hardware level, outside the scope of the operating system. If you have tried all of the above troubleshooting solutions, then you may need to update the BIO
Go to the HP Software and Driver Download page, enter your computer model number into the field provided, and install any keyboard and BIOS updates available for Windows.
For more information on updating the BIOS for a notebook, see Updating the BIOS. For more information on updating the BIOS for a desktop, see Updating the BIOS.
If, after updating the BIOS and device drivers, the Sleep or Hibernate mode problem still exists, contact HP support for additional assistance and support.

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