What should I do if the wireless light is not lit at all?
If the blue light on the printer control panel is not lit, wireless might be turned off. To turn on wireless or use the wireless setup wizard, on the printer control panel display touch the Wireless icon and then Settings, then touch Wireless to turn it on.
From the official HP Officejet Pro 7740 Wide Format All-in-One Printer manual, page 1
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