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Common problems for Connectivity Issues
We would like to share some of the most frequently asked questions about Printer Wi-Fi, Connectivity Issues and Offline Status. Check out this link: Printer Wi-Fi, Connectivity Issues and Offline Status..
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Printer was on, I was about to copy a document and when I pushed the ok button, printer powered off.

HP Recommended
HP 4630
macOS 10.13 High Sierra

I was about to print a document on my 4630 printer. Printer was on, I pushed the ok button to start the print job and printer powered off.  I cannot turn it on.

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On the backside where you plug the power cord, there should be a small hole where you can see the power supply control light it should be ON when the power core is plugged in if there is no light then the power supply failed, it's an easy fix 1 screw, you can buy replacement power supply yon eBay.

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