There are two ways to access the recovery manager while starting the notebook.
1) Press the power button and then immediately begin tapping the Esc key. The startup menu will appear. F11 is listed in the menu. Press the F11 key to invoke the HP Recovery Manager.
2) Press the power button and then immediately begin tapping the F11 key. If the recovery partition has never been disturbed or had anything stored to it, then the HP Recovery Manager window should appear.