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HP PCs - Troubleshooting sleep and hibernate issues (Windows 7)

This document pertains to HP and Compaq computers with Windows 7.

The computer will not wake up from sleep or hibernate mode

Restarting your computer erases all information in the computer's memory, which may restore functionality. Before performing these steps 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.

The computer wakes from sleep mode unexpectedly

If your computer wakes from sleep mode unexpectedly, see the information in this section to prevent hardware devices from waking the computer.

The computer will not go into sleep or hibernate mode

If the computer will not go into sleep or hibernate modes, use the following steps in order to troubleshoot.

Disabling the password requirement when resuming from sleep

If you are required to enter a password when you log on to your computer, the default setting will be the same for when the computer is resuming from sleep/hibernate mode.
Use the following instructions to eliminate the need to enter a password when resuming from sleep:

Disabling hybrid sleep in Windows 7

The hybrid sleep setting might cause an issue with sleep mode. Use the following steps to disable hybrid sleep:
  1. Click Start , and then click Control Panel.
  2. Click System and Security and then click Power Options. The Power Options window displays.
    Figure : Power Options
    Power Options window
  3. Click High Performance from Power Options.
    Figure : High performance
    High performance power plan in Power Options
  4. Click Change plan settings, and then select Change advanced power settings.
    The Power Options Advanced settings window appears.
    Figure : Advanced settings
    Power Options Advanced settings window
  5. Click the plus (+) sign next to Sleep.
  6. Click the plus (+) sign next to Allow hybrid sleep.
  7. Select Off from the drop-down menu.
    Figure : Advanced Power Settings
    Power Options with Allow hybrid sleep Off selected
  8. Click OK.

Understanding Windows 7 sleep and hibernate

Sleep: Pressing the Sleep key on the keyboard or clicking Sleep from the Windows 7 Shut down menu causes the computer to go into sleep mode. Closing the display panel on a notebook can also put the notebook in sleep mode. Sleep mode saves the state of all open applications to memory, then powers down both the display panel and hard disk drive. Only enough power is used to maintain the data in the memory. Restoring from sleep mode happens quickly, in most cases in a matter of seconds. Sleep mode is useful when you need to pause the computer for a short time. However, in a notebook, maintaining the power to the memory modules can drain a battery if the notebook is not plugged in.
Hibernate: Clicking Hibernate from the Windows 7 Shut down menu (if available) causes the computer to go into the hibernate mode. Hibernate saves the state of all open applications to the hard disk, then completely powers off the computer. The computer consumes no power while in hibernate mode. When you restart the computer, the previous state of all open applications is restored. Restarting from hibernate mode might take longer than restarting from sleep mode. Use Hibernate when you do not need your computer for an extended period of time.






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