What does the wireless light indicator on the control panel 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—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. If wireless is turned off, the wireless light is off and the display shows Wireless Off.
From the official HP Officejet 4650 All-in-One Printer manual, page 2
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