What do the different wireless light indicators on the printer mean?

A solid blue light indicates that wireless connection has been established and you can print. A slow blinking light indicates that wireless is on, but the printer is not connected to a network, so make sure your printer is within range of the wireless signal. A fast blinking light indicates a wireless error and you should refer to the message on the printer display. No light indicates that wireless is off.

From the official HP Envy Photo 7800 All-in-One Printer manual, page 1

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