What does it mean when the blue Wireless light is blinking on my printer?
A blinking blue wireless light means the wireless capability is turned on, but the printer is not yet connected to a wireless network. Once the printer successfully connects to a wireless network, the blue light will stay on steady rather than blink. (Page 1)
From the official HP Deskjet Ink Advantage 3700 All-in-One Printer manual, page 1
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