What does each wireless light indicator mean?
A solid blue light indicates wireless connection has been established and you can print. A slow blinking light indicates wireless is on but the printer is not connected to a network. A fast blinking light indicates a wireless error that requires checking the printer display message. If wireless is off, the light is off and the display shows Wireless Off.
From the official HP Envy 4520 All-in-One Printer manual, page 2
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