HP Deskjet 642c Printer - Manual (Page 45)

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Getting Help When Things Go Wrong 4
Both lights are flashing. The printer may need to
be reset. 1 Press the Power button to turn the
printer off. Then press the Power
button again to turn the printer back
on.
2 If that doesn’t solve the problem, press
the Power
button to turn the printer
off.
3 Unplug the printer.
4 Plug the printer back in.
5 Press the Power button to turn the
printer on.
What do the flashing lights mean? continued
What is the problem? Possible cause To solve the problem…