At work we have a HP Probook 4510S which keeps powering up on its own after a shutdown is completed. I have checked on its wake up on lan function and this is disabled in BIOS, i cannot think of any reason why it should restart itself when totally turned off, can anyone help?

What about your Wake on USB? Is it turned off as-well?

working with hp teck this help but also had to remove the LAN network cable!! :this issue may also happen if Windows stops responding during a typical operation or during the shutdown process. By default, the computer is configured to automatically restart when Windows stops responding. To disable this feature , perform the following steps: 1. Click the Start button, right-click My Computer, click Properties, click the Advanced tab, and then click Settings under Startup and Recovery. 2. Under System Failure, uncheck Automatically restart check box If during the shutdown process you may get a blue screen error next time. We also need to check if there is any memory dump created. Click on Start >> Run >> type %systemroot%\minidump Do you see any dump files? the issue could also happen due to ACPI power management settings, I suggest you to perform the following steps: Install system default settings to reset power management: http://h20000.www2.hp.com/bizsuppor... Restore BIOS defaults: 1. Disconnect the LAN network cable from the notebook PC. 2. Power on or restart the notebook PC. 3. Press F10 when the HP logo displays. 4. Select File and then select Restore Defaults. Press F10 to accept changes 5. select File and save and exit the BIOS setup. Please perform a dry boot on the notebook by following the below steps to discharge any static charges on the notebook: 1. Disconnect the unit from the AC adapter, and all external devices 2. Remove the battery and hold the power button for 45 seconds. This is to discharge any residual charge present in the unit completely 3. Restart the computer using only the AC adapter