Please perform the steps provided in the following web link:
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00304007&cc=uk&lc=en&dlc=en&product=391153
If the issue persists, please perform:
1. Unplug the power supply from the wall outlet.
2. Unplug the power supply from the back of the printer.
3. Wait at least 20 seconds, then plug in the supply back into the wall outlet.
4. Plug in the power supply back into the printer.
5. Press the power button to turn the printer on.
If the issue persists, please replace your printer, as this is a hardware issue.
:) Dr Tony
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