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HP PCs - Computer Turns On Unexpectedly (Windows 7, Vista, or XP)

This document pertains to HP PCs with Windows 7, Vista, or XP.
If your computer unexpectedly wakes from a full off state, sleep, or standby mode, use the steps in this document to prevent the computer from starting up unexpectedly.

Step 1: Check the mouse

If your mouse has a clear base, changes in light can pass through the clear plastic and cause the mouse to respond.
Figure : Mouse with clear plastic
Mouse with clear base highlighted
To prevent the computer from starting, place the mouse in a container or use a mouse cover when it is not being used.

Step 2: Preventing devices from starting the computer

Depending on which version of Windows your computer is using, use the instructions in one of the following sections to prevent devices from starting the computer.

Step 3: Removing connected devices if the computer starts unexpectedly

Disconnect all attached devices, such as printers, scanners, etc. Test with only the original mouse, monitor and keyboard connected. If this resolves the standby issue, replace the devices one by one to determine which devices is causing the issue.
The problem should now be fixed. If the computer still starts unexpectedly or if you did not have to remove any devices, continue with the next step to check the BIOS settings.

Step 4: Checking BIOS settings on Desktop PCs

Fluctuations in the amount of power that is supplied to the computer can cause the computer to start when the AC power loss feature is set to On or Autostart in the BIOS. Use the following steps to check if this option is enabled in the BIOS and to disable it if it is:
note:
This step is not available on notebooks and laptops.
note:
If you want to use the Autostart on AC Loss feature, it may help to connect the computer's power cord to a different power outlet.
Click the plus sign (+) for instructions to disable the power loss feature in your BIOS version.

Step 5: Updating the BIOS

If the computer still turns on unexpectedly after troubleshooting, you may need to update the BIOS to resolve this issue. To find out how to update the BIOS on your PC:

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