HP Deskjet 3520 Inkjet Printer - Manual (Page 39)

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.
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.
3. Read any error messages explaining the problem and its solution.