What should I do if I cannot print on my HP DeskJet 3630?
First, make sure the power cord connections are secure and the printer is powered on, and confirm that USB or wireless connections are working properly. You can also visit www.hp.com/go/tools to download free HP diagnostic utilities to help fix common printer problems. (Page 3)
From the official HP Deskjet 3630 All-in-One Printer manual, page 3
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