HP shipped media process is a little different than the rest.
HP shipped media covers multiple series and many different configurations. (One set of discs may cover a series that has 10 or even many more unique configurations)
Because of this the process first lays down a 'base' image, and then customizes the image for that specific configuration.
The last phase of the HP shipped recovery is installing and customizing the software for that specific model. This last phase can take a very long time, can have popup windows (that should not be clicked), and can involve multiple reboots. Specifically around 12%-19% on the display is where this occurs.
Please don't interact with the PC during this time.
Don't click on any popups unless the system completely stops for significant time.Unless there is a unknown error, the recovery process is actually designed to handle this.
For notebooks, this process can take 4-6 hours on certain configurations.