I had seen your post few days back and knew why this was happening but I actually wanted to verify if this was happening on a CQ41 Notebook when USB mouse was connected.
The notebook's Wake On LAN feature maintains a constant power supply to the USB ports even during shutdown in order to provide additional data channels to the notebook's network card. This is the expected behavior of the USB ports for this model of notebook.
To resolve this issue, disconnect the AC adapter from the notebook after it has shut down completely.
The latest BIOS for your Notebook is F.0F which can be found here and on most of the HP Notebooks , you can find an option called as "LAN Power Saving" (see picture below) in BIOS which is ENABLED by default and when disabled would resolve your issue as well.
Jeszcze cos takiego znalazlem. Masz opcje wake on lan. Wylacz.