What should I do if I cannot print from my HP DeskJet 3630?
First, make sure the power cord connections are secure and the printer is powered on — the Power button should be lit. Also confirm that USB or wireless connections are secure and working. You can 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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