What do the different wireless light behaviors mean on the HP Envy 5640?

A solid blue light indicates that a wireless connection has been established and you can print. A slow blinking light means wireless is on but the printer is not connected to a network, while a fast blinking light indicates a wireless error — you should refer to the message on the printer display. If wireless is turned off entirely, the wireless light will be off and the display screen will show 'Wireless Off.' (Page 2)