HP Deskjet 3420 Color Inkjet Printer - Manual (Page 80)

power light is flashing or on
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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, there is an error.
diagnosing possible errors
if an error message appears on screen
Read the on-screen error message explaining the problem and its solution.
if no error message appears on screen
1. Open the HP Inkjet Utility .
2. Select the Test panel, then click the Print a Test Page button.
3. Read any on-screen error messages that appear explaining the problem and its
solution.
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