HP 2 - Manual (Page 48)

power light is flashing
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If the Power light is on, the printer is either printing or ready to print.
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If the Power light is off, the printer is off.
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If the Power light is flashing, see below.
1. power light
what the flashing light means
The Power light can flash for several reasons:
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The printer cover is open.
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The printer is out of paper.
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There is a problem with the printer, such as a paper jam or a problem with a
print cartridge.
if an error message appears
Read the error message explaining the problem and its solution.
if no error message appears
1. Go to maintenance.
2. Click any of the four main buttons.
This will tell the software to check the status of the printer.